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((Short description|Period of 24 consecutive hours))
((Refimprove|date=December 2009))
[[File:Snowshill nychthemeron clock.jpg|thumb|The Nychthemeron Clock in [[Snowshill Manor]], Gloucestershire, UK]]
'''Nychthemeron''' ((IPAc-en|n|ɪ|k|ˈ|θ|ɛ|m|ər|ɒ|n)), occasionally '''nycthemeron''' or ''nuchthemeron'', is a period of 24 consecutive [[hour]]s. It is sometimes used, especially in technical literature, to avoid the ambiguity inherent in the term ''[[day]]''.

It is the period of time that a [[calendar]] normally labels with a [[calendar date|date]], although a nychthemeron simply designates a time-span that can start at any time, not just midnight.

== Etymology ==
It is a [[loanword]] from [[Ancient Greek]] ((lang|grc|νυχθήμερον)) (((Lang|grc-latn|nukhthḗmeron))), which appears in the New Testament.<ref>((Citation|last=Liddell|first=Henry George|title=An Intermediate Greek-English Lexicon|date=1889|url=https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0058%3Aentry%3Dnuxqh%2Fmeron|postscript=.|publication-place=Oxford|publisher=Clarendon Press|last2=Scott|first2=Robert|author-link=Henry George Liddell|author-link2=Robert Scott (philologist)))</ref> This is a noun use of the neuter singular form of ((Lang-grc|νυχθήμερος|nukhthḗmeros|lasting a day and night)), from ((Lang|grc|νύξ)) (((Lang|grc-latn|núx)), “night”) + ((Lang|grc|ἡμέρα)) (((Lang|grc-latn|hēméra)), “day”).((wiktionary|nychthemeron|νυχθήμερον|Position=right))
==In other languages==
Some languages have a word for 24 hours, or more loosely a day plus a night in no particular order. Unlike a calendar date, only the length is defined, with no particular start or end. Furthermore, these words are considered basic and native to these languages, so unlike ''nychthemeron'' they are not associated with [[jargon]].

Words for 24 hours are listed in the middle column. For comparison, the word for ''day'', in the meaning of [[daytime]], the ''sunlit state'', the opposite of night, is also listed in the rightmost column:
{| class="wikitable sortable"
|-
! Language !! Family !! 24 hours !! Sunlit state
|-
| [[Danish language|Danish]] || [[Germanic languages|Germanic]] || døgn || dag
|-
| Norwegian ([[Bokmål]]) || [[Germanic languages|Germanic]] || døgn || dag
|-
| Norwegian ([[Nynorsk]]) || [[Germanic languages|Germanic]]|| døgn, døger || dag
|-
| [[Swedish language|Swedish]] || [[Germanic languages|Germanic]] || dygn || dag
|-
| [[Icelandic language|Icelandic]] || [[Germanic languages|Germanic]] || sólarhringur ("sun-circle") || dagur
|-
| [[Faroese language|Faroese]] || [[Germanic languages|Germanic]] || samdøgur || dagur
|-
| [[Old Norse]] || [[Germanic languages|Germanic]] || dǿgr, dǿgn || dagr
|-
| [[North Frisian language|North Frisian]] || [[Germanic languages|Germanic]] || eetlem || däi
|-
| [[West Frisian language|West Frisian]] || [[Germanic languages|Germanic]] || etmel || dei
|-
| [[Dutch language|Dutch]] || [[Germanic languages|Germanic]] || etmaal || dag
|-
| [[Esperanto]] || [[International auxiliary language]]|| diurno,<ref name="ReVoDiurno">[http://purl.org/net/voko/revo/art/diurn.html#diurn.0o.KAL diurn/o] in [[Reta Vortaro]]</ref> tagnokto<ref name="ReVoTagnokto">[http://purl.org/net/voko/revo/art/nokt.html#nokt.tag0o nokt/o] in Reta Vortaro</ref> ("day-night") || tago
|-
| [[Finnish language|Finnish]] || [[Uralic languages|Uralic]] || vuorokausi ("turn-period")|| päivä
|-
| [[Estonian language|Estonian]] || [[Uralic languages|Uralic]] || ööpäev ("night-day") || päev
|-
| [[Sámi languages|North Sámi]] || [[Uralic languages|Uralic]] || jándor || beaivi
|-
| [[Latvian language|Latvian]] || [[Baltic languages|Baltic]] || diennakts ("day-night") || diena
|-
| [[Lithuanian language|Lithuanian]] || [[Baltic languages|Baltic]] || para || diena
|-
| [[Polish language|Polish]] || [[Slavic languages|Slavic]] || doba || dzień
|-
| [[Russian language|Russian]] || [[Slavic languages|Slavic]] || сутки ((IPA-ru|ˈsutkʲɪ|)) || день
|-
| [[Hebrew language|Hebrew]] || [[Semitic languages|Semitic]] || יממה || יום
|-
| [[Bulgarian language|Bulgarian]] || [[Slavic languages|Slavic]] || денонощие ("day-night") || ден
|-
| [[Bengali language|Bengali]] || [[Indo-Aryan languages|Indo-Aryan]] || দিবারাত্রি, দিনরাত || দিন
|-
| [[Sanskrit language|Sanskrit]] || [[Indo-Aryan languages|Indo-Aryan]] || अहोरात्र || दिन
|-
| [[Tamil language|Tamil]] || [[Tamil languages|Tamil]] || நாள் || பகல்
|-
| [[Ukrainian language|Ukrainian]] || [[Slavic languages|Slavic]] || доба || день
|-
| [[Swahili language|Swahili]] || [[Bantu languages|Bantu]] || siku || mchana
|-
| [[Indonesian language|Indonesian/Malay]] || [[Malayic languages|Malayic]] || hari || siang
|-
| [[Japanese language|Japanese]]|| [[Japonic languages|Japonic]] || 日 || 昼
|-
| [[Korean language|Korean]]|| [[Koreanic languages|Koreanic]] || 일 || 낮
|-
| [[Kannada language|Kannada]] || [[Kannada dialects|Kannada–Badaga]] || ದಿನ || ಹಗಲು
|-
| [[Welsh language|Welsh]] || [[Insular Celtic languages|Celtic]] || ((lang|cy|italic=no|diwrnod)); ((lang|cy|italic=no|dwthwn)) ('that day') || ((lang|cy|italic=no|dydd))
|-
| [[Yiddish language|Yiddish]] || [[Germanic languages|Germanic]] || ֵמֵעֵת לְעֵת || טאָג 
|-
|}

The word ((Lang|da|dag)), as in the Nordic languages, is [[Etymology|etymologically]] [[cognate|the same as]] ''day'' in English.

==References==
((Reflist))

((Time Topics))

[[Category:Units of time]]
[[Category:Calendars]]


((Measurement-stub))
((time-stub))

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