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((short description|Experimental constructed language))
((Infobox language
| name             = Ithkuil
| nativename       = ''Iţkuîl''
| pronunciation    = ((IPA|/ɪθˈkʊ.il/))
| region           = none
| speakers         = 1
| familycolor      = philosophical language
| creator          = John Quijada
| created          = ((nobr|1978–2023)) <br>
((nobr|2023–present)) (as New Ithkuil)
| script           = Morphophonemic
| iso3             = none
| image            = ((Switcher|[[File:Ithkuil-name-v4.svg|frameless]]|New Ithkuil writing system|[[File:Ithkuil-name.svg|frameless]]|Ithkuil writing system|
[[File:Ilaksh-name.svg|frameless]]|Ilaksh writing system|[[File:Ithkuil_in_Ithkuil_I.svg|frameless]]|Ithkuil (2004) writing system))
| imagecaption     = ''Iţkuîl'' written in the Ithkuil writing systems
| notice           = IPA
| glotto           = none
| ietf             = [https://www.kreativekorp.com/clcr/ art-x-ithkuil]
))

'''Ithkuil''' is an [[experimental language|experimental]] [[constructed language]] created by John Quijada.<ref name="foer-2012">((cite magazine |author=Foer |first=Joshua |date=December 16, 2012 |title=Utopian for Beginners: ''An amateur linguist loses control of the language he invented.'' |url=https://www.newyorker.com/magazine/2012/12/24/utopian-for-beginners |access-date=February 27, 2022 |magazine=[[The New Yorker]]))</ref> It is designed to express more profound levels of human cognition briefly yet overtly and clearly, particularly about human categorization. It is a cross between an [[a priori (languages)|a priori]] [[philosophical language|philosophical]] and a [[logical language]]. It tries to minimize the vagueness and [[semantic ambiguity]] in natural human languages.<ref name="intro">((cite web |last=Quijada |first=John |date=2004–2019 |title=A Grammar of the Ithkuil Language - Introduction |url=http://www.ithkuil.net/00_intro.html |access-date=February 27, 2022 |website=ithkuil.net))</ref> Ithkuil is notable for its grammatical complexity and extensive [[phoneme]] inventory, the latter being simplified in an upcoming redesign. The name "Ithkuil" is an [[Anglicisation (linguistics)|anglicized]] form of ''Iţkuîl'', which in the original form roughly meant "hypothetical representation of a language."<ref name="intro" /> Quijada states he did not create Ithkuil to be [[international auxiliary language|auxiliary]] or used in everyday conversations. Instead, he wanted the language for more elaborate and profound fields where more insightful thoughts are expected, such as philosophy, arts, science, and politics.<ref name="faqs">((cite web |last=Quijada |first=John |date=2004–2019 |title=Ithkuil FAQs |url=http://ithkuil.net/faqs.html |access-date=February 27, 2022 |website=ithkuil.net))</ref>

Meaningful phrases or sentences can usually be expressed in Ithkuil with fewer linguistic units than natural languages.<ref name="intro"/> For example, the two-word Ithkuil sentence "''Tram-mļöi hhâsmařpţuktôx''" can be translated into English as "On the contrary, I think it may turn out that this rugged mountain range trails off at some point."<ref name="intro"/> Quijada deems his creation as too complex to have developed naturally, seeing it as an exercise in exploring how languages could function. Nevertheless, it was featured in the Language Creation Conference's 6th Conlang Relay.

Four versions of the language have been publicized: the initial version in 2004, a simplified version called Ilaksh in 2007, a third version in 2011, and the current version (as of February 2023), called New Ithkuil.<ref>((Cite web|url=http://www.ithkuil.net/new_morpho-phonology_v_0_8.pdf|title=Newest Update|last=Quijada|first=John|date=June 26, 2019|website=Ithkuil.net|url-status=dead|archive-url=https://web.archive.org/web/20190903154026/http://www.ithkuil.net/new_morpho-phonology_v_0_8.pdf|archive-date=2019-09-03))</ref><ref>((Cite web|last=Quijada|first=John|date=October 3, 2020|title=Morphophonology Version 0.15|url=http://www.ithkuil.net/morpho-phonology_v_0_15.pdf|access-date=April 2, 2021|archive-date=August 27, 2021|archive-url=https://web.archive.org/web/20210827130110/http://www.ithkuil.net/morpho-phonology_v_0_15.pdf|url-status=dead))</ref><ref>((Cite web|last=Quijada|first=John|date=March 4, 2021|title=Morphophonology Version 0.15.8.1|url=http://www.ithkuil.net/morpho-phonology_v_0_18_5.pdf|access-date=April 2, 2021|archive-date=August 27, 2021|archive-url=https://web.archive.org/web/20210827130108/http://www.ithkuil.net/morpho-phonology_v_0_18_5.pdf|url-status=dead))</ref><ref>((Cite web |last=Quijada |first=John |year=2023 |title=A GRAMMAR OF NEW ITHKUIL |url=http://ithkuil.net/ |url-status=live |archive-url=https://web.archive.org/web/20230221182935/http://www.ithkuil.net/ |archive-date=21 February 2023 |access-date=24 February 2023))</ref> In 2004<ref name="kozl">((Cite web |last=Козловский |first=Станислав |date=29 July 2004 |title=Скорость мысли |url=http://old.computerra.ru/xterra/205420/ |url-status=dead |archive-url=https://web.archive.org/web/20160513164753/http://old.computerra.ru/xterra/205420/ |archive-date=13 May 2016 |access-date=27 February 2022 |website=Компьютерра |language=ru))</ref>—and again in 2009<ref name="gertelmann">((cite magazine|url=http://library.conlang.org/articles/ithkuil_Komputerra_17.pdf|title=Ithkuil and its philosophical design|language=ru|author=Mikhail Gertelman|magazine=Computerra|volume=17|issue=781|year=2009|page=12))</ref> with Ilaksh—Ithkuil was featured in the Russian-language popular science and IT magazine ''[[Computerra]]''. In 2008, [[David J. Peterson]] awarded it the Smiley Award.<ref>((cite web |last=Peterson |first=David J. |date=August 3, 2018 |title=The 2008 Smiley Award Winner: Ithkuil |url=http://dedalvs.com/smileys/2008.html |access-date=February 27, 2022 |website=The Smiley Award))</ref> In 2013, Bartłomiej Kamiński codified the language to parse complicated sentences quickly.<ref>((cite web |last=ebvalaim |date=January 14, 2016 |title=Making fun with Ithkuil easier |url=https://ebvalaim.net/en/2016/01/14/making-fun-with-ithkuil-easier |access-date=October 27, 2023 |website=ebvalaim.log))</ref> Julien Tavernier and anonymous others have since followed suit.<ref>((Cite web |date=n.d. |title=Transcription of Ithkuil |url=http://www.laethiel.fr/ithkuil/transcript.php |access-date=February 27, 2022 |website=laethiel.fr))</ref> Since July 2015, Quijada has released several Ithkuil songs in a [[progressive rock|prog-rock]] style as part of the album ''Kaduatán'', which translates to "Wayfarers."<ref>((Cite web |title=John Quijada |url=https://www.youtube.com/channel/UCJ6BcuwscfmMl1pQp0gEX-g |access-date=February 27, 2022 |website=[[YouTube]]))</ref> Recently, online communities have developed in English, Russian, Mandarin, and Japanese.
((TOC limit|4))

==History==

===Influences===
[[File:Ithkuil pull uiqisx.png|frame|
An example of vertical [[boustrophedon]]ic Ithkuil text (2004).

'''Translation:''' "As our vehicle leaves the ground and plunges over the edge of the cliff toward the valley floor, I ponder whether it is possible that one might allege I am guilty of an act of moral failure, having failed to maintain a proper course along the roadway."

'''Romanized:''' Pull̀ uíqišx ma’wałg eřyaufënienˉ päţwïç auxë’yaļt xne’wïļta’şui tua kit öllá yaqazmuiv li’yïrzişka’ p’amḿ aìlo’wëčča šu’yehtaş
<br>((IPA-all|ˈpʊl꜔꜖.l̩ ʊˈɪ꜔꜖qɪʃx ˈma꜔꜖ʔwaɫɡ ɛʁjaʊfɤˈnɪ˥ɛn ˈpæθ꜔꜖wɯç aʊˈxɤ꜔꜖ʔjaɬt xnɛʔwɯɬˈtaʔ꜔꜖ʂʊɪ ˈtʊ꜔꜖a kɪt꜔꜖ œlːˈa꜔꜖ jaˈqaz꜔꜖mʊɪv lɪʔjɯɾˈzɪʂ꜔꜖kaʔ p’am.ˈm̩꜔꜖ a.ɪlɔˈwɤ꜔꜖tʃːa ʃʊʔˈjɛh꜔꜖taʂ|'''[[International Phonetic Alphabet|IPA]]:'''|Ithkuil_pull_uiqisx.ogg))]]
Ithkuil evolved over 45 years as a linguistic experiment beyond Western Indo-European languages in response to [[Linguistic relativity|the Sapir-Whorf hypothesis]] and [[Charles J. Fillmore]]’s case grammar into "a complex, intricate array of interwoven grammatical concepts" with "ideas inspired by countless hours studying texts in [[theoretical linguistics]], [[cognitive grammar]], [[psycholinguistics]], [[language acquisition]], [[linguistic relativity]], [[semantics]], [[semiotics]], [[philosophy]], [[fuzzy set theory]], and even [[Quantum Physics|quantum physics]]." Ithkuil was heavily inspired by cognitive linguists including [[George Lakoff]], [[Ronald Langacker]], [[Gilles Fauconnier]], and [[Leonard Talmy|Len Talmy]].

For his influences, Quijada cites the obscure "morphophonology of [[Abkhaz language|Abkhaz]] verb complexes, the [[Grammatical mood|moods]] of verbs of certain [[Indigenous languages of the Americas|American Indian languages]], the [[Grammatical aspect|aspectual]] system of [[Niger–Kordofanian languages]], the [[Ergative case|nominal]] [[Noun case|case systems]] of [[Basque language|Basque]] and [[Northeast Caucasian languages|Dagestanian languages]], the [[enclitic]] system of the [[Wakashan languages]], the positional orientation systems of [[Tzeltal language|Tzeltal]] and [[Guugu Yimithirr language|Guugu Yimithirr]], the [[Semitic root|Semitic triliteral root]] morphology, and the hearsay and possessive categories of [[Suzette Elgin]]'s [[Láadan]] language". The writing system's logical design borrows principles from [[Ge'ez script|Ethiopic]] and [[Brahmi script|Brahmi]] scripts, but employs a unique morphophonemic principle.<ref name="intro" /> The script used throughout the Ithkuil grammar bears a superficial resemblance to [[Hebrew script|Hebrew]] square script and the various [[Klingon script|Klingon]] fonts. Furthermore, Ilaksh had a "[[cartouche]] script" and a cursive format (the former of which had been an upcoming [[aesthetics|aesthetic]] project of the designer's).

=== Ilaksh (2007) ===
The initial publication of Ithkuil in 2004 had an extensive phonology of 65 [[consonant]]s and 17 [[vowel]]s. After a mention of Ithkuil in the Russian magazine ''Computerra'',<ref name="kozl" /> several speakers of Russian contacted Quijada and expressed enthusiasm to learn Ithkuil for its application to psychonetics, with several complaining about its difficulty in pronunciation. Quijada remade Ithkuil's [[morphophonology]] with 30 consonants and 10 vowels (and the addition of [[Tone (linguistics)|tones]]) and published the revision on 10 June 2007 as Ilaksh.<ref name="intro" /> The language featured other amendments to grammar, including some additional Levels and a change of Cases. It was redesigned to be easier to speak and included an additional writing system.<ref>((cite web|url=http://ithkuil.net/ilaksh/images/script_diagram.gif|archive-url=https://web.archive.org/web/20110605210044/http://ithkuil.net/ilaksh/images/script_diagram.gif|title=Ilaksh script diagram (indicates what the various parts of an Ilaksh logogram indicate)|archive-date=June 5, 2011|url-status=dead))</ref><ref>((Cite web|url=http://ithkuil.net/11_script.htm#Sec11o6|title=A Grammar of the Ithkuil Language - Chapter 11: The Writing System|website=ithkuil.net))</ref><ref>((Cite web|url=http://www.ithkuil.net:80/ilaksh/Chapter_11.htm|archive-url=https://web.archive.org/web/20090522161309/http://www.ithkuil.net/ilaksh/Chapter_11.htm|url-status=dead|archive-date=2009-05-22|title=A Grammar of the Ithkuil Language - Chapter 11: The Script|date=2009-05-22|access-date=2018-08-10))</ref> The initial sequential "informal" system suitable for handwriting or compact typesetting, and a "formal" [[logographic]] system with artistic possibilities resembling [[Maya script]]s.

In the "informal" writing system, several parallel sets of lines are shaped to correspond sequentially to the different parallel sets of lexemes and inflections. It is directly pronounceable. The author designed it with reserve for convenient handwriting. The overall design would permit compact, clear, black-and-white rendering.

In the colorful "formal" script, a single complex glyph represented an entire sentence. Diversely shaped, shaded and superimposed cartouches represent the [[syntax|syntactic]] relations of the verb and noun phrases of a sentence. The edges of the cartouches had particular shapes that indicate one set of inflections, the colors indicate another set of inflections, and the textures yet another one. On the cartouches, letters of hexagonal outline would spell out the forms of particular [[lexeme]]s. The cartouches formed phrases, with primary phrases overlapping subordinate phrases. The coloring system utilized different color densities and texturing for different colors in order to be usable by colorblind people. These density conventions also allowed the formal system to be inexpensively printed in black-and-white, or inscribed or imprinted on stone or other materials.<ref name="script">((Cite web|url=http://www.ithkuil.net/11_script.htm|title=A Grammar of the Ithkuil Language - Chapter 11: The Writing System|website=www.ithkuil.net))</ref>

=== Ithkuil (2011) ===
Ilaksh was superseded by a morphologically similar language also termed Ithkuil because of its ties to the initial publication. The script uses a unique morphophonemic principle that allows sentences representing grammatical categories to be pronounced in multiple ways as the speaker sees fit. It was deemed the final version of the language, which grew attention to conlangers on social media. One blog translates "I am sleepy because those damn cats were fighting all night and I couldn’t sleep well!" as ''ur-rn aičnattîbi tei n-nrai’dáčnuitîb ti wëqam-msukšš hwaičúitôkçuxh rrolp żü’âluss''.<ref>((Cite web|title=Ithkuil for Beginners. A Hypothetical Lesson • Aitôxhalin Açnalüpç|url=https://eloertkha.svbtle.com/ithkuil-for-beginners-a-hypothetical-lesson|website=Aitôxhalin Açnalüpç on Svbtle|date=19 August 2014 |language=en))</ref>

In 2014 the category of ''register'' was introduced and in 2015 a mathematical and measurement-based sublanguage was published. Dozens on the community [[Reddit]] forum have proposed revisions to make the language more learnable. Quijada plans to adopt the cartouche script "for use as an alternative, 'ornamental' writing system for artistic purposes" to Ithkuil in a future update of the language.

=== New Ithkuil (2023) ===
Owing to complaints about the difficult patterns in the language morphology, on 30 October 2017 Quijada published a tentative outline for a new version of the language, addressing learners' desires for a more [[Agglutination|agglutinative]] morphophonology, including a restructured formative outline, and extended use of Adjuncts for shortened expression of the grammar to further create [[phonaesthetics]]. Quijada has considered mandating verbal categories expressed in formatives to be redundantly spoken aloud in adjuncts to be more naturalistic. Despite the complexity of the language, intended only as an experiment without concern for the constraints of human learnability, he has published several updates for a new language predicated off the original grammar, most recently in November 2019.<ref>((Cite web|url=https://www.reddit.com/r/Ithkuil/comments/4z1h58/a_long_message_from_john_q_about_a_future_reform/|title=r/Ithkuil - A (LONG) MESSAGE FROM JOHN Q ABOUT A FUTURE REFORM OF ITHKUIL|website=reddit|date=22 August 2016 |language=en|access-date=2019-05-03))</ref><ref>((Cite web|url=http://www.ithkuil.net/updates.htm|title=Ithkuil Update|website=ithkuil.net|url-status=live|archive-url=https://web.archive.org/web/20191029145623/http://www.ithkuil.net/updates.htm|archive-date=2019-10-29|access-date=2019-05-03))</ref> The new language is intended to feature an expanded lexicon and writing system that can be handwritten.

In February 2023, Quijada published the fourth iteration of the language, titled '''New Ithkuil''', and announced that the previous version would remain online for archival purposes.<ref>((cite web | url=http://www.ithkuil.net/00_intro.html | title=A Grammar of the Ithkuil Language - Introduction ))</ref>

== Outline ==
((hatnote|The information below refers to '''New Ithkuil''' which was published in early 2023.))
=== Phonology ===
The phonology consists of 31 consonants and 9 vowels. The consonants are as follows:
{| class="IPA wikitable" style="text-align:center"
|-
! colspan="2" rowspan="2" |
! rowspan="2" | [[Labial consonant|Labial]]
! rowspan="2" | [[Dental consonant|Dental]]
! colspan="2" | [[Alveolar consonant|Alveolar]]
! rowspan="2" |[[Alveolar consonant|Alveolar]]~[[Retroflex consonant|Retroflex]]
! rowspan="2" | [[Postalveolar consonant|Post-<br>alveolar]]
! rowspan="2" | [[Palatal consonant|Palatal]]
! rowspan="2" | [[Velar consonant|Velar]]
! rowspan="2" | [[Uvular consonant|Uvular]]
! rowspan="2" | [[Glottal consonant|Glottal]]
|- 
! <small>[[Central consonant|central]]</small>
! <small>[[Lateral consonant|lateral]]</small>
|-
! colspan="2" | [[Nasal consonant|Nasal]]
| ((IPAlink|m))  ([[Voiceless bilabial nasal|m̥]]) ''hm''
| ((IPAlink|n̪)) ''n'' 
([[Voiceless alveolar nasal|n̪̥]]) ''hn''
| ||
| || || || ((IPAlink|ŋ)) ''ň/ņ'' || ||
|- 
! rowspan="3" | [[Stop consonant|Stop]]/
[[Affricate consonant|Affricate]]
! <small>[[voice (phonetics)|voiced]]</small>
| ((IPAlink|b))|| ((IPAlink|d̪)) ''d'' || ((IPAlink|d͡z)) ''ẓ''||
| || ((IPAlink|d͡ʒ)) ''j''|| || ((IPAlink|ɡ))|| ||
|- 
! <small>[[Voicelessness|voiceless]]</small>
| ((IPAlink|p))|| ((IPAlink|t̪)) ''t'' || ((IPAlink|t͡s)) ''c''||
| || ((IPAlink|t͡ʃ)) ''č''|| || ((IPAlink|k))|| || ((IPAlink|ʔ)) ''’''
|-
![[Aspirated consonant|<small>aspirated</small>]]
|(pʰ) ''ph''
|(t̪ʰ) ''th''
|(t͡sʰ) ''ch''
|
|
|(t͡ʃʰ) ''čh''
|
|(kʰ) ''kh''
|
|
|- 
! rowspan="2" | [[Fricative consonant|Fricative]]
! <small>voiced</small>
| ((IPAlink|v))|| ((IPAlink|ð)) ''ḑ'' || ((IPAlink|z))||
| || ((IPAlink|ʒ)) ''ž'' || || || ||
|- 
! <small>voiceless</small>
| ((IPAlink|f))|| ((IPAlink|θ)) ''ţ'' || ((IPAlink|s))|| ((IPAlink|ɬ)) ''ļ'' 
| || [[Voiceless postalveolar fricative|ʃ]] ''š'' || ((IPAlink|ç))|| colspan="2" | ((IPAlink|x))~[[Voiceless uvular fricative|χ]]|| ((IPAlink|h))
|-
! colspan="2" |[[Trill consonant|Trill]]
|
|
|
|
|([[Voiced alveolar trill|r]]) ''rr''
|
|
|
|([[Voiced uvular trill|ʀ]]) ''řř''
|
|- 
! colspan="2" | [[Flap consonant|Flap]]
| || || ||
|[[Voiced dental and alveolar taps and flaps|ɾ]]~((IPAlink|ɽ)) ''r''   ([[Voiceless alveolar tap|ɾ̥]]) ''hr''|| || || || ||
|- 
! colspan="2" | [[Approximant consonant|Approximant]]
|((IPAlink|w))
| || ||[[Voiced alveolar lateral approximant|l̪]]  ''l''
| ([[Voiced alveolar approximant|ɹ]]) ''r''|| || [[Voiced palatal approximant|j]] ''y'' || (((IPAlink|w))) || ((IPAlink|ʁ̞)) ''ř'' ||
|}
The consonants ''c’,'' ''č’'', ''k’'', ''p’'', ''q'', ''qʰ'', ''q’'', ''t’'', and ''xh'' are eliminated, ''x'' is pronounced ((IPA|[x]~[((IPAlink|χ))])), ''ň'' will be written as ''n'' before ''k'', ''g'', or ''x'', and ''dh'' is now written as ''ḑ'' (or optionally ''đ'' or ''ḍ''). The clusters with h are disyllabic in word-medial positions, but usually form allophones when found at the beginning of words. For example, word-medially ''kh'' would be pronounced [kh] as in the English word "bac'''kh'''anded", but ''kh'' is pronounced [kʰ] in the New Ithkuil word "'''kh'''ala". The forms ''hl'', ''hr'', ''hm'', and ''hn'' can be pronounced either as [ɬ], [ɾ̥], [m̥], and [n̥] respectively, or as separate consonants. Combinations of a voiced consonant plus following -'''h'''- are always dissyllabic. ''r'' is pronounced as a tap [ɾ], but becomes a trill [r] when geminated. Following another consonant, a non-geminated ''r'' may optionally be pronounced as an apico-alveolar-retroflex approximant [ɹ]. When ''ř'' is geminated it is either [ʁ:] or can be strengthened to a uvular trill [ʀ].

The vowels are as follows:
{| class="wikitable"
|-
! !! [[Front vowel|Front]] !! [[central vowel|Central]] !! [[back vowel|Back]]
|-
! [[Close vowel|Close]]
| [[Close front unrounded vowel|i]]~[[Near-close near-front unrounded vowel|ɪ]] ''i''|| ((IPAlink|ʉ))~[[Close front rounded vowel|y]] ''ü'' || ((IPAlink|u))~[[Near-close near-back rounded vowel|ʊ]] ''u''
|-
! [[Close-mid vowel|Close-mid]]
| ((IPAlink|e))~[[Open-mid front unrounded vowel|ɛ]] ''e''    ((IPAlink|ø))~[[Open-mid front rounded vowel|œ]] ''ö''|| ((IPAlink|ə))~[[Open-mid back unrounded vowel|ʌ]] ''ë'' || ((IPAlink|o))~[[Open-mid back rounded vowel|ɔ]] ''o''
|-
! [[Open vowel|Open]]
| ((IPAlink|æ)) ''ä'' || ((IPAlink|a))~[[Open back unrounded vowel|ɑ]] ''a''
|
|}
The vowels ''ê'', ''î'', ''ô'', and ''û'' are removed from Ithkuil III to allow for easier memorization. The letter ''ä'', pronounced ((IPA|[æ])), is introduced. ''a'' is pronounced ((IPA|[a]~[ɑ])), ''e'' is pronounced ((IPA|[e]~[ɛ])), ''i'' is pronounced ((IPA|[i]~[ɪ])), ''o'' is pronounced ((IPA|[o]~[ɔ])), ''u'' is pronounced ((IPA|[u]~[ʊ])), ''ë'' is pronounced ((IPA|[ə]~[ʌ])), ''ü'' is pronounced as ((Ipa|[ʉ]~[y])), and ''ö'' is pronounced as ((Ipa|[ø]~[œ])). Rules for external junction between words have been described for speakers to be able to clearly parse word boundaries.

Stress is marked with an acute diacritic on letters without diacritics and the circumflex on letters with a diaeresis. The letters ''i'' and ''u'' are marked with a grave diacritic when they are unstressed and the first of more than one vowel after a consonant to remind the reader that they are pronounced [iː] and [u] and not [j] nor [w], respectively.

=== Grammar ===
The grammar is largely the same as in Ithkuil III, but with a greater focus on the scope of grammatical categories to be more logical. Stem pattern has been replaced by stem specification, and Suffixes were renamed Affixes. The categories of Designation, Sanction, and Modality have been supplanted by affixual forms. Possessive cases are named Appositive; Associative cases split into Associative, Adverbial, Relational, and Affinitive; and Comparative cases are eliminated. The Ca complex is modular and various categories follow a 9-valued vowel sequence. Incorporated roots have been replaced by a system of concatenation. Formatives and personal reference categories now have the option to carry Effect, a category prescribing beneficial, detrimental, or neutral states to a referent.((Overly detailed inline|date=April 2021))

=== Lexicon ===
The lexicon includes over 6000 roots and 600 affixes.

=== Writing system ===
[[File:Ithkuil IV example.svg|thumb|280px|An example of Ithkuil's script meaning ''"Be careful, your fork is actually a fennec."'']]
Ithkuil's writing system is unique to the language and is not similar to any natural writing systems. The writing system is morpho-phonetic, meaning two types of graphemes are used: one to represent different grammatical concepts, such as case, number etc. and the other to represent roots and affixes. John Quijada provides an example, saying that an example of word in a morpho-phonemic writing system would be ''gø'' (pronounced ''went''), where the root would be "go" and past tense would be indicated by diagonal bar through the vowel.

== Possible advantages ==
The [[Linguistic relativity|Sapir–Whorf hypothesis]] postulates that a person's language influences their perceptions and cognitive patterns. Stanislav Kozlovsky speculated<ref name="kozl" /> in the Russian popular-scientific magazine ''Computerra'' that a fluent speaker of Ithkuil, accordingly, would think "about five or six times as fast" as a speaker of a typical natural language. The Sapir–Whorf hypothesis would suggest that, Ithkuil being an extremely precise and [[synthetic language]], its speakers would have a more discerning, deeper understanding both of everyday situations and of broader phenomena, and of abstract [[philosophy|philosophical]] categories.

However, strong forms of the hypothesis, which postulate that language ''determines'' thought and not only influences it, have been rejected by mainstream linguistics.<ref>((Citation|last=Ahearn|first=Laura|title=Living language: an introduction to linguistic anthropology|date=6 May 2011 |page=69|edition=1. publ.|location=Oxford|publisher=Wiley-Blackwell|isbn=9781405124416))</ref> Moreover, in line with this, Quijada has stated he does not believe a speaker would think necessarily any faster because even though Ithkuil is terse, a single word requires a lot more thought before it can be spoken than it would in a natural language.<ref name="FAQ">((Cite web|url=http://www.ithkuil.net/faqs.html|title=FAQs|website=www.ithkuil.net))</ref>

Kozlovsky also likened Ithkuil to the fictional ''[[Speedtalk]]'' from [[Robert A. Heinlein]]'s novella ''[[Gulf (Heinlein)|Gulf]]'', and contrasted both languages with the ''[[Newspeak]]'' of the communicationally restricted society of [[George Orwell|Orwell]]'s ''[[Nineteen Eighty-Four]]''. Ithkuil is by far the most complete language of the three, as the lexicon and grammar are described in far greater detail. John Quijada acknowledged the similarity of Ithkuil's design goals to those of Speedtalk,<ref name="faqs" /> remarking that,

((Quote
|text=[h]owever, Heinlein's Speedtalk appears to focus only on the morpho-phonological component of language[, whereas] Ithkuil has been designed with an equal focus on [morphology, lexico-morphology, or lexico-semantics]. Additionally, the apparent purpose of Heinlein's language is simple rapidity/brevity of speech and thought, while Ithkuil is focused on maximal communication in the most efficient manner, a somewhat different purpose, in which brevity ''per se'' is irrelevant.
))

==Past versions==
===Ithkuil (2004)===
The original version of Ithkuil had a significantly more complicated morphophonology.

==== Phonology ====

At the left of each cell in the table below is the phoneme, and at the right its transliterated representation. The original 65 consonants were as follows:

{| class="IPA wikitable" style="text-align:center"
|-
! colspan="2" rowspan="2" |
! rowspan="2" | [[Labial consonant|Labial]]
! rowspan="2" | [[Dental consonant|Dental]]
! colspan="2" | [[Alveolar consonant|Alveolar]]
! rowspan="2" | [[Retroflex consonant|Retroflex]]
! rowspan="2" | [[Postalveolar consonant|Post-<br>alveolar]]
! rowspan="2" | [[Palatal consonant|Palatal]]
! rowspan="2" | [[Velar consonant|Velar]]
! rowspan="2" | [[Uvular consonant|Uvular]]
! rowspan="2" | [[Pharyngeal consonant|Pharyngeal]]
! rowspan="2" | [[Glottal consonant|Glottal]]
|- 
! <small>[[Central consonant|central]]</small>
! <small>[[Lateral consonant|lateral]]</small>
|-
! colspan="2" | [[Nasal consonant|Nasal]]
| ((IPAlink|m)) || ((IPAlink|n̪)) ''n'' || || || || || || ((IPAlink|ŋ)) ''ņ'' || || ||
|- 
! rowspan="4" | [[Stop consonant|Plosive]]
! <small>[[voice (phonetics)|voiced]]</small>
| ((IPAlink|b)) || ((IPAlink|d̪)) ''d'' || || || || || ((IPAlink|ɟ)) ''ǰ'' || ((IPAlink|ɡ)) || ((IPAlink|ɢ)) ''ġ'' || ||
|- 
! <small>[[Voicelessness|voiceless]]</small>
| ((IPAlink|p)) || ((IPAlink|t̪)) ''t'' || || || || || ((IPAlink|c)) ''ķ'' || ((IPAlink|k)) || ((IPAlink|q)) || || ((IPAlink|ʔ)) ''’''
|- 
! <small>[[Aspirated consonant|aspirated]]</small>
| pʰ || t̪ʰ ''tʰ'' || || || || || cʰ ''ķʰ'' || kʰ || qʰ || ||
|- 
! <small>[[Ejective consonant|ejective]]</small>
| ((IPAlink|pʼ)) || ((IPAlink|t̪ʼ)) ''tʼ'' || || || || || ((IPAlink|cʼ)) ''ķʼ'' || ((IPAlink|kʼ)) || ((IPAlink|qʼ)) || ||
|- 
! rowspan="4" | [[Affricate consonant|Affricate]]
! <small>voiced</small>
| || || ((IPAlink|d͡z)) ''ƶ'' || || ((IPAlink|ɖ͡ʐ)) ''ż'' || ((IPAlink|d͡ʒ)) ''j'' || || || || ||
|- 
! <small>voiceless</small>
| || || ((IPAlink|t͡s)) ''c'' || || ((IPAlink|ʈ͡ʂ)) ''ċ'' || ((IPAlink|t͡ʃ)) ''č'' || || || || ||
|- 
! <small>aspirated</small>
| || || t͡sʰ ''cʰ'' ||cʎ̥˔ʰ ''q̌''
| ʈ͡ʂʰ ''ċʰ'' || t͡ʃʰ ''čʰ'' || || || || ||
|- 
! <small>ejective</small>
| || || ((IPAlink|t͡sʼ)) ''c’'' || || ((IPAlink|ʈ͡ʂʼ)) ''ċʼ'' || ((IPAlink|t͡ʃʼ)) ''č’'' ||c͡çʼ ''çʼ''
|k͡xʼ ''xʼ''
|q͡χʼ ''x̧ʼ''
| ||
|- 
! rowspan="2" | [[Fricative consonant|Fricative]]
! <small>voiced</small>
| ((IPAlink|v)) || ((IPAlink|ð)) ''ḑ'' || ((IPAlink|z)) || || ((IPAlink|ʐ)) ''z̧'' || ((IPAlink|ʒ)) ''ž'' || ((IPAlink|ʝ)) ''y̌'' || ((IPAlink|ɣ)) ''ǧ'' || || ||
|- 
! <small>voiceless</small>
| ((IPAlink|f)) || ((IPAlink|θ)) ''ţ'' || ((IPAlink|s)) || ((IPAlink|ɬ)) ļ || ((IPAlink|ʂ)) ''ş'' || ((IPAlink|ʃ)) ''š'' || ((IPAlink|ç)) || ((IPAlink|x)) || ((IPAlink|χ)) ''x̧'' || ((IPAlink|ħ)) ''ḩ'' || ((IPAlink|h))
|-
! rowspan="2" |[[Liquid consonant|Liquid]]
!<small>[[Flap consonant|flap]]</small>
|
|
|
|
|((IPAlink|ɽ)) ''r''
|
|
|
|
|
|
|-
!<small>non-flap</small>
|
|
|
|((IPAlink|l̪)) ''l''
|((IPAlink|ɻ)) ''ŗ''
|
|
|
|
|
|
|- 
! colspan="2" | [[Approximant consonant|Approximant]]
| ((IPAlink|w))|| || ||((IPAlink|ɫ̪)) ''ł''
| || || ((IPAlink|j)) ''y''|| || ((IPAlink|ʁ̞)) ''ř''|| ||
|}

((IPA|/w ɫ̪/)) were velarized and ((IPA|/m n̪ ŋ l ɫ ɻ/)) could be syllabic. ''h'' was ((IPA|[ɸ])) when preceded by a vowel and followed by another consonant. ((IPA|[cʎ̥˔ʰ])) was in free variation with ((IPA|[cʎ̥˔ʼ])), the latter being more common at the beginning of a word (both spelled ''q̌''). All consonants except ''y'' and ''w'' could be geminated; when geminated, ''h'' was a [[Voiceless bidental fricative|bidental fricative]] (((IPA|[h̪͆]))) and ''r'' was an [[alveolar trill]] (((IPA|[r]))).

At the left of each cell in the table below is the phoneme, and at the right its transliterated representation. The original 17 vowels are as follows:
{| class="wikitable"
|-
!
![[Front vowel|Front]]
![[Central vowel|Central]]
![[Back vowel|Back]]
|-
![[Close vowel|Close]]
|((IPAlink|i)) ''î'' ((IPAlink|y)) ''ÿ''
|((IPAlink|ʉ)) ''ü''
|((IPAlink|ɯ)) ''ï'' ((IPAlink|u)) ''û''
|-
![[Near-close vowel|Near-close]]
|((IPAlink|ɪ)) ''i''
|
|((IPAlink|ʊ)) ''u''
|-
![[Close-mid vowel|Close-mid]]
|((IPAlink|e)) ''ê'' ((IPAlink|ø))
|
|((IPAlink|ɤ)) ''ë'' ((IPAlink|o)) ''ô''
|-
![[Open-mid vowel|Open-mid]]
|((IPAlink|ɛ)) ''e'' ((IPAlink|œ)) ''ö''
|
|((IPAlink|ɔ)) ''o''
|-
![[Open vowel|Open]]
|((IPAlink|æ)) ''ä''
|((IPAlink|a))
|((IPAlink|ɑ)) ''â''
|}
The diphthongs were ((IPA|/ai̯/)), ((IPA|/æi̯/)), ((IPA|/ei̯/)), ((IPA|/ɤi̯/)), ((IPA|/øi̯/)), ((IPA|/oi̯/)), ((IPA|/ʊi̯/)), ((IPA|/au̯/)), ((IPA|/æu̯/)), ((IPA|/eu̯/)), ((IPA|/ɤu̯/)), ((IPA|/ɪu̯/)), ((IPA|/ou̯/)), ((IPA|/øu̯/)), ((IPA|/aɯ̯/)), ((IPA|/eɯ̯/)), ((IPA|/ɤɯ̯/)), ((IPA|/ʊɯ̯/)), ((IPA|/oɯ̯/)), ((IPA|/ɪɯ̯/)), ((IPA|/æɯ̯/)), ((IPA|/øɯ̯/)), ((IPA|/ʉɯ̯/)), ((IPA|/ae̯/)). All other sequences of vowels were pronounced as separate syllables.

==== Grammar ====
The lexicon of the original Ithkuil consisted of the same patterns as the 2011 form of the language. However, each root consisted of 2 consonantal ''radicals'', and could [[Derivation (linguistics)|derive]] thousands of [[lexeme]]s through the use of Ithkuil's complex rules of morphophonology, which involved both consonantal and vocal mutation, shifts in syllabic stress and tone, and [[affixation]].

Ithkuil words can be divided into just two parts of speech, ''formatives'' and ''adjuncts''. Formatives functioned both as nouns and as verbs, depending on the morphosemantic context. Formatives were inflected for the current grammatical categories, plus 2 [[Focus (linguistics)|''foci'']], and 81 ''cases''; they could also have taken on some of the 153 affixes, which further qualified into one of 9 ''degrees''. Verbal formatives were additionally inflected for 7 ''conflations''.

''Verbal adjuncts'' similarly worked in conjunction with adjacent formatives to provide additional grammatical information. Two types of verbal adjuncts were inflected to indicate 14 [[Valency (linguistics)|''valencies'']], 6 ''versions'', 8 ''formats'', 37 ''derivations'', 30 [[Linguistic modality|''modalities'']], 4 [[Comparative|''levels'']], 9 [[Evidentiality|''validations'']], 9 ''phases'', 9 ''sanctions'', 32 [[Grammatical aspect|''aspects'']], 8 [[Grammatical mood|''moods'']], and 24 ''biases''.

====An example of morphological analysis====
:''(based entirely on the original Ithkuil grammar book)''

The word ''iţkuîl'' was a ''formative'' derived from the ''root'' ''k-l'' (broadly concerning "speech", "voice", or even "interpretation") through the addition of several morphological determinants:
* The '''-u-''' vocalic infix
:''kul'' was the ''holistic'' variety of the ''Stem 2'' of the three other possible stems from ''k-l''. Translating roughly as "a meaningful unit of speech", i.e. "a word", it gave no emphasis on the meaning or the vocal rendering of the word.
* The '''u → uî''' mutation of the infix
:''Secondary'' ''mode'', as opposed to ''primary'' ''mode'', meant that the word ''kuîl'' is not to refer to a real-life phenomenon, but rather to a mental representation, or projection, of that phenomenon; to an imaginary or hypothetical object. Thus translating as, "a made-up word".
* A ''grade 8'' mutation of the first radical consonant: '''k → ţk'''
:The ''configuration'' of the term was ''composite''. Roughly corresponding to the [[plural]]ity concept in [[Indo-European languages]], it also implies the objects in question (words, ''kuîl'') to be diverse, while forming a "coherent emergent entity" (rather than just a collection or an array of different words), thus meaning "a vocabulary" or "lexicon".
* The '''i-''' vocalic prefix, one of the 24 possible for formative roots
:The ''extension'' was ''delimitive'', perceiving "vocabulary" as entire, with clearly distinguished boundaries, as opposed to it being just a local manifestation((spaced ndash))such as slang or a dialect((spaced ndash))of a broader lexicon (''-ţkuîl'').
:The ''affiliation'' of the set of objects in question was ''coalescent''. This indicates that the individual members of the set act together toward a higher purpose by coordinating their complementary functions. Thus, "a vocabulary/lexicon" becomes "a language".
* [[Stress (linguistics)|Syllabic stress]] on the penultimate syllable (''-u-'')
:The ''perspective'' of the noun is ''monadic'', seeing "the language" as a single and specific entity, rather than a collection of many languages existing separately, the general phenomenon ("human languages") or the abstract idea of language.
Thus, the approximate translation of ''iţkuîl'' was "an idea/fantasy of a complete purposeful system of complementary speech elements", or simply "an imaginary language".

=== Ilaksh (2007) ===
In an effort to make the language more speakable, Quijada created a revision called ''Ilaksh'' that relied on tone to reduce the phonemic inventory.

The phonological system of Ilaksh was revised to consist of only 30 consonants and 10 vowels. The consonants are the same as those of Ithkuil IV with the omission of the voiceless alveolar lateral fricative ((IPAlink|ɬ)). /[[Bilabial nasal|m]] [[Denti-alveolar nasal|n̪]] [[Velar nasal|ŋ]] [[Alveolar lateral approximant|l]] [[Retroflex flap|ɽ]]/ could be syllabic. All consonants except /[[Palatal approximant#Palatal|j]] [[Voiced labio-velar approximant|w]] [[Glottal stop|ʔ]]/ could be geminated; when geminated, [[Voiceless glottal fricative|h]] was a [[Voiceless bidental fricative|bidental fricative]] or a [[voiceless pharyngeal fricative]], and [[Retroflex flap|ɽ]] was an [[alveolar trill]]. The clusters /n̪j/, /tj/, /dj/, and /lj/ could be pronounced as such or as the palatals [ɲ], [c], [ɟ], and [ʎ]. The orthography used /đ ŧ ż/ instead of /ḑ ţ ẓ/.

The vowels were the same as those of Ithkuil IV, but with an additional vowel pronounced as /[[Close central unrounded vowel|ɨ]]/ or /[[Close back unrounded vowel|ɯ]]/. The 14 diphthongs of Ilaksh were ((IPA|/ai̯/)), ((IPA|/æi̯/)), ((IPA|/ei̯/)), ((IPA|/əi̯/)), ((IPA|/oi̯/)), ((IPA|/øi̯/)), ((IPA|/ui̯/)), ((IPA|/au̯/)), ((IPA|/æu̯/)), ((IPA|/eu̯/)), ((IPA|/əu̯/)), ((IPA|/iu̯/)), ((IPA|/ou̯/)), and ((IPA|/øu̯/)). All other sequences of vowels were pronounced as separate syllables.

=== Ithkuil (2011) ===

==== Phonology ====
Ithkuil has 45 consonants and 13 vowels. At the left of each cell in the table below is the [[phoneme]], and at the right its transliterated representation if it is not written the same in [[International Phonetic Alphabet|IPA]] as in romanized Ithkuil. The consonants are as follows:<ref name="phonology">((Cite web |title=A Grammar of the Ithkuil Language - Chapter 1: Phonology |url=http://www.ithkuil.net/01_phonology.html |website=www.ithkuil.net))</ref>
{| class="IPA wikitable" style="text-align:center"
|-
! colspan="2" rowspan="2" |
! rowspan="2" | [[Labial consonant|Labial]]
! rowspan="2" | [[Dental consonant|Dental]]
! colspan="2" | [[Alveolar consonant|Alveolar]]
! rowspan="2" | [[Retroflex consonant|Retroflex]]
! rowspan="2" | [[Postalveolar consonant|Post-<br>alveolar]]
! rowspan="2" | [[Palatal consonant|Palatal]]
! rowspan="2" | [[Velar consonant|Velar]]
! rowspan="2" | [[Uvular consonant|Uvular]]
! rowspan="2" | [[Glottal consonant|Glottal]]
|- 
! <small>[[Central consonant|central]]</small>
! <small>[[Lateral consonant|lateral]]</small>
|-
! colspan="2" | [[Nasal consonant|Nasal]]
| ((IPAlink|m)) || ((IPAlink|n̪)) ''n'' || || || || || || ((IPAlink|ŋ)) ''ň'' || ||
|- 
! rowspan="4" | [[Stop consonant|Plosive]]/
[[Affricate consonant|Affricate]]
! <small>[[voice (phonetics)|voiced]]</small>
| ((IPAlink|b)) || ((IPAlink|d̪)) ''d'' || ((IPAlink|d͡z)) ''ż''|| || || ((IPAlink|d͡ʒ)) ''j''|| || ((IPAlink|ɡ)) || ||
|- 
! <small>[[Voicelessness|voiceless]]</small>
| ((IPAlink|p)) || ((IPAlink|t̪)) ''t'' || ((IPAlink|t͡s)) ''c''|| || || ((IPAlink|t͡ʃ)) ''č''|| || ((IPAlink|k)) || ((IPAlink|q)) || ((IPAlink|ʔ)) ''’''
|- 
! <small>[[Aspirated consonant|aspirated]]</small>
| pʰ || t̪ʰ ''tʰ'' || t͡sʰ ''cʰ''|| || || t͡ʃʰ ''čʰ''|| || kʰ || qʰ ||
|- 
! <small>[[Ejective consonant|ejective]]</small>
| ((IPAlink|pʼ)) || ((IPAlink|t̪ʼ)) ''tʼ'' || ((IPAlink|t͡sʼ)) ''c’''|| || || ((IPAlink|t͡ʃʼ)) ''č’''|| || ((IPAlink|kʼ)) || ((IPAlink|qʼ)) ||
|- 
! rowspan="2" | [[Fricative consonant|Fricative]]
! <small>voiced</small>
| ((IPAlink|v)) || ((IPAlink|ð)) ''dh'' || ((IPAlink|z)) || || || ((IPAlink|ʒ)) ž || || || ||
|- 
! <small>voiceless</small>
| ((IPAlink|f)) || ((IPAlink|θ)) ''ţ'' || ((IPAlink|s)) || ((IPAlink|ɬ)) ''ļ'' || || ((IPAlink|ʃ)) ''š'' || ((IPAlink|ç)) || ((IPAlink|x)) || ((IPAlink|χ)) ''xh'' || ((IPAlink|h))
|- 
! colspan="2" | [[Flap consonant|Flap]]
| || || || || ((IPAlink|ɽ)) ''r'' || || || || ||
|- 
! colspan="2" | [[Approximant consonant|Approximant]]
| || || || ((IPAlink|l)) || || || ((IPAlink|j)) ''y'' || ((IPAlink|w)) || ((IPAlink|ʁ̞)) ''ř'' ||
|}
((IPA|/m n̪ ŋ l ɽ/)) can be syllabic. All consonants except ((IPA|/j w ʔ/)) can be [[geminated]]; when geminated, ((IPA|/h/)) is a [[voiceless bidental fricative|bidental fricative]] or a [[voiceless pharyngeal fricative]] (((IPA|[((IPAlink|ħ))]))), and ((IPA|/ɽ/)) is an [[alveolar trill]].

The 13 vowels of Ithkuil are as follows:<ref name="phonology" />
{| class="wikitable"
|-
! !! [[front vowel|Front]] !! [[central vowel|Central]] !! [[back vowel|Back]]
|-
! [[Close vowel|Close]]
| ((IPAlink|iː)) ''î'' || ((IPA|((IPAlink|ʉ))~((IPAlink|y)))) ''ü'' || ((IPAlink|uː)) ''û''
|-
! [[Near-close vowel|Near-close]]
| ((IPAlink|ɪ)) ''i'' || || ((IPAlink|ʊ)) ''u''
|-
! [[Close-mid vowel|Close-mid]]
| ((IPAlink|eː)) ''ê'' || || ((IPAlink|oː)) ''ô''
|-
! [[Mid vowel|Mid]]
| ((IPA|((IPAlink|œ))~((IPAlink|ø)))) ''ö'' || ((IPAlink|ə)) ''<ë>'' ||
|-
! [[Open-mid vowel|Open-mid]]
| ((IPAlink|ɛ)) ''e'' || || ((IPAlink|ɔ)) ''o''
|-
! [[Open vowel|Open]]
| || ((IPAlink|ä)) ''a'' || ((IPAlink|ɑ)) ''â''
|}
((IPA|/((IPAlink|ɪ)) ((IPAlink|ʊ))/)) are pronounced as ((IPA|/((IPAlink|i)) ((IPAlink|u))/)) when they precede another vowel, and at the end of a word. ((IPA|/((IPAlink|ɛ)) ((IPAlink|ɔ))/)) are pronounced ((IPA|/((IPAlink|e)) ((IPAlink|o))/)) when they precede another vowel, except ((IPA|/((IPAlink|ɪ)) ((IPAlink|ʊ))/)).

The diphthongs in Ithkuil are ((IPA|/äɪ̯/)), ((IPA|/ɛɪ̯/)), ((IPA|/əɪ̯/)), ((IPA|/ɔɪ̯/)), ((IPA|/ø̞ɪ̯/)),  ((IPA|/ʊɪ̯/)), ((IPA|/äʊ̯/)), ((IPA|/ɛʊ̯/)), ((IPA|/əʊ̯/)), ((IPA|/ɪʊ̯/)), ((IPA|/ɔʊ̯/)), ((IPA|/ø̞ʊ̯/)). All other sequences of vowels are pronounced as separate syllables. The grave accent is used to indicate the vowel sequence is not a diphthong. The grave and acute accents are used for stress. In a future revision of the language, circumflex accents will be used for stress, but grave accents will not be used for stress, and will only be used to indicate the vowel sequence is not a diphthong so that the rules for marking stress are simplified.

==== Morphophonology ====
Ithkuil words can be divided into just two [[Part of speech|parts of speech]], ''Formatives'' and ''Adjuncts''. Formatives can function both as nouns and as verbs, derived from the root and depending on the morphosemantic context. They can be expanded through various ‘suffixes’.<ref name="morphophonology">((Cite web |title=A Grammar of the Ithkuil Language - Chapter 2: Morpho-Phonology |url=http://ithkuil.net/02_morpho-phonology.html |website=ithkuil.net))</ref> Adjuncts serve two roles, either indicating personal referents like pronouns, or specifying additional verbal information such as grammatical bias. In a future version of the language, adjuncts will be able to convey suffix (or rather, affix) information.

====Formatives====
((Overly detailed|section|nosplit=1|details=needlessly goes into detail about grammatical categories|date=April 2021))

Roots are Ithkuil's most basic semantic units. All Ithkuil formatives are derived from a limited number of roots. Each root consists of a cluster of 1–4 consonants (five-consonant clusters are also available, but remain without an assigned meaning).<ref name="morphophonology" /> The current [[lexicon]] of Ithkuil can potentially consist of approximately 3,600 [[Root (linguistics)|word roots]], just over 1000 of which have been assigned definitions.<ref name="morphophonology" /><ref name="lexicon">((Cite web |title=Lexicon |url=http://www.ithkuil.net/lexicon.htm |website=www.ithkuil.net))</ref> From the root, word stems are formed by affixing the vocalic affix that indicates stem ''pattern'', stem type, ''function'' for the stem, and by stressing a particular syllable to indicate informal or formal designation.<ref name="morphophonology" />

There are three stems associated with each root. Each stem comes in three patterns, one holistic and two complementary ones. Holistic stem 1 typically refers to the most general manifestation of a root, whereas holistic stems 2 and 3 typically refer to more specific manifestations associated with the root. Each holistic stem has two complementary stems associated with it, which refer to the complementary concepts related to the holistic stem.<ref name="morphophonology" /> The specific meaning of complementary stems depends somewhat on the root. These are derived from the word roots by prefixing a vowel or diphthong that also indicates the grammatical category ''function''.<ref name="morphophonology" /> Two examples are given in the tables below:

{| class="wikitable" style="text-align:center"
|-
! colspan="2" | Holistic stem 1 !! colspan="2" | Holistic stem 2 !! colspan="2" | Holistic stem 3
|-
| colspan="2" | nuclear family member<br>''(a)mm-'' || colspan="2" | male nuclear family member<br>''emm-'' || colspan="2" | female nuclear family member<br>''umm-''
|-
! colspan="2" | Complementary stems !! colspan="2" | Complementary stems !! colspan="2" | Complementary stems
|-
| parent<br>''omm-'' || child<br>''âmm-'' || father<br>''ömm-'' || son<br>''êmm-'' || mother<br>''îmm-''/''ûmm'' || daughter<br>''ômm-''
|}

{| class="wikitable" style="text-align:center"
|-
! colspan="2" | Holistic stem 1 !! colspan="2" | Holistic stem 2 !! colspan="2" | Holistic stem 3
|-
| colspan="2" | higher-order animal lifeform<br>''(a)q-'' || colspan="2" | human being<br>''eq-''|| colspan="2" | non-human higher-order animal lifeform<br>''uq-''
|-
! colspan="2" | Complementary stems !! colspan="2" | Complementary stems !! colspan="2" | Complementary stems
|-
| male higher-order animal lifeform<br>''oq-'' || female higher-order animal lifeform<br>''âq-'' || male human being<br>''öq-''|| female human being<br>''êq-''|| male non-human higher-order animal lifeform<br>''îq-'' / ''ûq-''|| female non-human higher-order animal lifeform<br>''ôq-''
|}

=====Basic morphology=====
All Ithkuil formatives, whether functioning as nouns or verbs, inflect for various grammatical categories that are quite dissimilar from any of those in natural languages.<ref name="morphology">((Cite web |title=A Grammar of the Ithkuil Language - Chapter 3: Basic Morphology |url=http://www.ithkuil.net//03_morphology.html |website=www.ithkuil.net))</ref> Quantization is more or less covered by the grammatical categories of ''Configuration'', ''Affiliation'', and ''Perspective'', even though these do not technically refer to number ''per se''.<ref name="morphology" />

====== Configuration ======
The nine configurations (Uniplex, Duplex, Discrete, Aggregative, Segmentative, Componential, Coherent, Composite, Multiform) describe the physical similarity and relationship between the members of a set, e.g. trees may occur in a collection of the same species, of different species, or even in a patternless collection with plants that are not trees.

====== Affiliation ======
The four affiliations (Consolidative, Associative, Variative, Coalescent) describe the subjective purpose or function of members of a set, e.g. a group of trees may occur naturally and have no purpose, they may have the same purpose, complementary purposes, or different purposes.

====== Perspective ======
The four perspectives (Monadic, Unbounded, Nomic, Abstract) describe the boundedness of a set, i.e. if it is viewed as a single unit, multiple disconnected units, viewed generically, or its characteristics considered abstractly.

====== Extension ======
The six extensions (Delimitive, Proximal, Inceptive, Terminative, Graduative, Depletive) describe the referred part of a set, e.g. its beginning or its end.

====== Essence ======
The two essences (Normal, Representative) describe whether the referred set is in the real world or exists solely psychologically.

====== Context ======
The four contexts (Existential, Functional, Representational, Amalgamate) describe the psychological relevance of the set, e.g. merely its existence or the set as symbolic for something else.

====== Designation ======
The two designations (Informal, Formal) describe the authority or permanence of a set.

====== Version ======
The six versions (Processual, Completive, Ineffectual, Incompletive, Positive, Effective) describe whether the action is goal-oriented or not, and whether the action is successfully completed.

====== Register ======
The five registers (Narrative, Discursive, Parenthetical, Cogitant, Impressionistic) describe the mode of personal communication (narration, personal cogitation, subjective impression, direct speech, parenthetical “aside”).

=====Cases=====
There are 96 [[grammatical case]]s in Ithkuil, one special case being the Vocative, used for direct address. Verbal formatives inflect for case under Frame constructions (i.e., [[dependent clause]]s). The grammatical cases of Ithkuil can be divided into several distinct groups:<ref name="case">((Cite web |title=A Grammar of the Ithkuil Language - Chapter 4: Case Morphology |url=http://www.ithkuil.net/04_case.html |website=www.ithkuil.net))</ref>

{| class="wikitable"
|-
! Category !! Identifies
!Amount
|-
| Transrelative || the participants to the verb
|11
|-
| Possessive || possessive relationships between nouns
|7
|-
| Associative || non-possessive relationships between nouns and adverbial relationships with verbs
|32
|-
| Temporal || temporal relationships
|15
|-
| Spatial || spatial relationships; this does not cover spatial relationships such as 'to be inside of', which are covered by separate formatives
|6
|-
| Comparison || comparisons to other nouns, used in conjunction with Level
|24
|}

=====Verbal morphology=====
Several distinct grammatical categories apply only to verbal formatives. These are listed below:<ref name="verbs1">((Cite web |title=A Grammar of the Ithkuil Language - Chapter 5: Verb Morphology |url=http://www.ithkuil.net/05_verbs_1.html |website=www.ithkuil.net))</ref>

====== Function ======
The four functions describe the general relationship that the verbal formative has with its nominal participants (state, action, description). Ithkuil nominal formatives also carry a ''function'', but cannot be inflected for them, always remaining in the "stative".<ref name="verbs1" />

====== Mood ======
The eight moods describe attitudes or perspectives on the act or the degree of factuality.

====== Illocution ======
The six illocutions describe the general purpose of the speech act (assertion, question, warning, demand, etc.).

====== Relation ======
The two relations describe whether the verbal formative is part of a subordinate clause.

====== Phase ======
The nine phases describe the temporal pattern of the act or occurrence.

====== Sanction ======
The nine sanctions describe the sort of truthfulness the listener should ascribe to it (assertion, allegation, counterargument, refutation, etc.).

====== Valence ======
The fourteen valences describe the manner of participation of two separate entities to the verbal formative.

====== Validation ======
The six validations describe the evidence supporting the statement.

====== Aspect ======
The 32 aspects describe the temporal relationship of the verbal formative in its context.

====== Bias ======
The 24 biases describe the speaker's emotional attitude towards the action.

====Suffixes====

Ithkuil uses a variety of affixes, termed suffixes, to further delineate what is described by the formative. They come in three types and often correlate with adverbs.

====Adjuncts====
There are two types of adjuncts in Ithkuil: personal-reference adjuncts and verbal adjuncts.<ref name="morphophonology" /> All adjuncts are highly [[synthetic language|synthetic]].

Personal reference adjuncts are akin to pronouns in English. There are two types of personal-reference adjuncts in Ithkuil: Single-referent and dual-referent.<ref name="adjuncts">((Cite web |title=A Grammar of the Ithkuil Language - Chapter 8: Adjuncts |url=http://www.ithkuil.net/08_adjuncts.html |website=www.ithkuil.net))</ref>

Verbal adjuncts are adjuncts that work in conjunction with verbal formatives to provide information about the latter's ''Valence'', ''Level'', ''Phase'', ''Sanction'', ''Illocution'', ''Modality'', ''Aspect'', and ''Bias''.<ref name="morphophonology" /> Of these, ''Modality'' and ''Level'' can only be indicated using verbal adjuncts, whereas the others can also be expressed on the verbal formative.<ref name="verbs2">((Cite web |title=A Grammar of the Ithkuil Language - Chapter 6: More Verb Morphology |url=http://www.ithkuil.net/06_verbs_2.html |website=www.ithkuil.net))</ref>

==== Numerical system ====
Ithkuil uses a [[Radix|base 100]] numeral system with roots for the numbers 1 to 10, and a stem-specific derivative suffix used with a number root to add a multiple of 10, providing the numerals up to 99. Ithkuil did not originally use the concept of zero. Numbers greater than 100 are expressed through multiple formatives, and a special numerical script has [[logogram]]s for the numbers 1 to 100 and exponential powers of 100. On 27 March 2015, Quijada released a mathematical sublanguage using a [[dozenal]] number system which uses the circle constant [[Tau (number)|tau]].<ref name="math">((Cite web |title=Expressing mathematics and measurement in Ithkuil |url=http://www.ithkuil.net/ithkuil_math_and_measurement.pdf))</ref>

==== Orthography ====
[[File:Ithkuil-ex001.jpg|thumb|"Tram-mļöi hhâsmařpţuktôx" written in the Ithkuil script. English translation: "On the contrary, I think it may turn out that this rugged mountain range trails off at some point"]]

Ithkuil uses a morphophonemic script because characters convey both phonetic and morphological information. (Notably, it has no alphabet as such.) Its use is closely tied to Ithkuil's grammatical system, which allows much of the phonological aspect of words to be morpho-syntactically inferred. Those parts of an Ithkuil word whose pronunciation is predictable are not written, whereas the characters used to indicate the pronunciation of the unpredictable parts of a word also convey the grammatical information necessary to reconstruct the implicit phonetics. Words are thus written in a highly abbreviated manner, particularly useful for the highly inflected, occasionally elongated words of the Ithkuil language. The script is also used alphabetically for transliterating foreign words and mathematical expressions.<ref name="script" />
((-))

==References==
((reflist|2))

==External links==
* ((Official website))
* ((cite magazine 
|last=Foer
|first=Joshua
|date=December 16, 2012
|title=Utopian for Beginners
|url=https://www.newyorker.com/magazine/2012/12/24/utopian-for-beginners
|access-date=April 30, 2022 
|magazine=The New Yorker))
* [https://www.reddit.com/r/Ithkuil Community on Reddit devoted to the Ithkuil language]
* [http://ithkuil-russian.narod.ru/ Information site] (Russian)
* [https://ryanlo713.gitbooks.io/ithkuil-chinese-translate/content Chinese Translation]

((Constructed languages))

[[Category:Engineered languages]]
[[Category:Fusional languages]]
[[Category:Constructed languages introduced in the 2000s]]
[[Category:Grammatical cases]]
[[Category:2004 introductions]]
[[Category:Constructed languages]]

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