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((short description|Internet-based electronic dictionary and translation dictionary))
((More citations needed|date=November 2013))
((Infobox website
| name             = LEO GmbH
| logo             = Leo.org (logo).png
| company_type     = [[GmbH]]
| foundation       = 3 April 2006
| founder          =
| location         = [[Sauerlach, Germany]]
| revenue          =
| operating_income =
| net_income       =
| num_employees    = 16
| parent           =
| url              = ((url|www.leo.org))
| screenshot       =
| caption          =
| website_type     = [[Online dictionaries]]
| language         = German (source language), English, French, Spanish, Italian, Chinese, Russian, Portuguese, Polish
| advertising      = Google [[AdSense]], image banners and buttons
| registration     = optional
| launch_date      = 5 June 1994
| current_status   = active
))
'''LEO''' (meaning ''Link Everything Online'') is an Internet-based [[electronic dictionary]] and [[translation dictionary]] initiated by the [[computer science]] department of the [[Technical University of Munich]] in [[Germany]]. After a [[Corporate spin-off|spin-out]], the [[dictionary|dictionaries]] have been run since 3 April 2006 by the limited liability company Leo [[Gesellschaft mit beschränkter Haftung|GmbH]], formed by the members of the original Leo team, and are partially funded by commercial advertising on the website. Its dictionaries can be consulted free online from any [[web browser]] or from LEO's ''Lion'' downloadable user interface ([[GUI]]), which is free since version 3.0 (released 13 January 2009), to private users only, and no longer sold as shareware. Corporate users and research institutions are however required to purchase a license.

== Dictionaries ==
The website hosts eight free [[German language]] based [[bilingual dictionaries]] and forums for additional language queries. The dictionaries are characterized by providing translations in forms of [[hyperlink]]s to further dictionary queries, thereby facilitating back [[translation]]s. The dictionaries are partly added to and corrected by large vocabulary donations of individuals or companies, partly through suggestions and discussions on the LEO language forums.

For any of the eight foreign languages, there's at least one (in the cases of English and French two) qualified employee in charge (whose mother tongue is either German and who has studied the respective other idiom or vice versa). These employees oversee the above-mentioned donations and suggestions before integrating them in the dictionary. Thus, an entry can never be simply made by a registered user. These registered users, on the other hand, have the possibility to communicate in the eight different forums where native German speakers and the other native speakers collaborate alike, providing help with finding idiomatic equivalents for phrases or texts etc.<ref>((cite web |url=http://dict.leo.org/pages.ende/faq_de.html#dict |title= LEO Wörterbuch: FAQ|website=dict.leo.org |archive-url=https://web.archive.org/web/20130204035242/http://dict.leo.org/pages.ende/faq_de.html |archive-date=February 4, 2013))</ref>

=== English–German ===
The [[English language|English]]-[[German language|German]] dictionary run by Leo since 1995 contains around 800,000 entries and receives an average of 11 million queries per weekday.<ref name="dict.leo ende">((cite web |url=http://dict.leo.org/pages.ende/stat_de.html?lp=ende&lang=en |title= LEO: Dict-Statistik|website=dict.leo.org |archive-url=https://web.archive.org/web/20120207100631/http://dict.leo.org/pages.ende/stat_de.html?lp=ende&lang=en |archive-date=February 7, 2012))</ref>

=== French–German ===
In 2004, a [[French language|French]]–[[German language|German]] dictionary was added to the site's services and has about 257,000 entries. This one gets about 2.6 million queries each weekday.<ref name="dict.leo frde">((cite web |url=http://dict.leo.org/pages.frde/stat_de.html?lp=frde&lang=en |title= LEO: Dict-Statistik|website=dict.leo.org |archive-url=https://web.archive.org/web/20120207100640/http://dict.leo.org/pages.frde/stat_de.html?lp=frde&lang=en |archive-date=February 7, 2012))</ref>

=== Spanish–German ===
A [[Spanish language|Spanish]]–German dictionary with about 208,000 entries was introduced on 3 April 2006. It gets about 2 million queries each weekday.<ref name="dict.leo esde">((cite web |url=http://dict.leo.org/pages.esde/stat_de.html?lp=esde&lang=en |title= LEO: Dict-Statistik|website=dict.leo.org |archive-url=https://web.archive.org/web/20120207100650/http://dict.leo.org/pages.esde/stat_de.html?lp=esde&lang=en |archive-date=February 7, 2012))</ref>

=== Italian–German ===
An [[Italian language|Italian]]-German was started on 3 April 2008. At the time of the public launch, the dictionary contained about 140,000 entries and received 77,000 queries on the first day.<ref name="dict.leo itde">((cite web |url=http://dict.leo.org/pages.itde/stat_de.html?lp=itde&lang=de |title= LEO: Dict-Statistik|website=dict.leo.org |archive-url=https://web.archive.org/web/20130205180235/http://dict.leo.org/pages.itde/stat_de.html?lp=itde&lang=de |archive-date=February 5, 2013))</ref> 

=== Chinese–German ===
The [[Chinese language|Chinese]]–German dictionary was started on the same date as the Italian–German dictionary, 3 April 2008. Queries can be entered by using [[Pinyin]], or [[Traditional Chinese character|traditional]] or [[Simplified Chinese character|simplified]] characters.<ref name="dict.leo chinese input">((cite web |url=http://dict.leo.org/pages.chde/tipps_de.html?lp=chde&lang=de |title= LEO Wörterbuch: Suchtipps|website=dict.leo.org |archive-url=https://web.archive.org/web/20130204155650/http://dict.leo.org/pages.chde/tipps_de.html?lp=chde&lang=de |archive-date=February 4, 2013))</ref> The dictionary started with about 65,000 entries and received about 93,000 queries on the first day.<ref name="dict.leo chde">((cite web |url=http://dict.leo.org/pages.chde/stat_de.html?lp=chde&lang=de |title= LEO: Dict-Statistik|website=dict.leo.org |archive-url=https://web.archive.org/web/20130204155842/http://dict.leo.org/pages.chde/stat_de.html?lp=chde&lang=de |archive-date=February 4, 2013))</ref> Today it contains about 195,000 entries and receives an average of 240,000 queries each weekday. Due to text encoding limitations, the Chinese dictionary cannot be used in the interface.

=== Russian–German ===
On 18 February 2009, LEO announced<ref>((cite web |title=Pages |url=http://dict.leo.org/pages.ende/impressum_en.html?lang=en |archive-url=https://web.archive.org/web/20120614085128/http://dict.leo.org/pages.ende/impressum_en.html?lang=en |archive-date=June 14, 2012 |website=dict.leo.org))</ref> a forthcoming release of a German–Russian dictionary. The starter database has been provided in collaboration with ABBY Europe GmbH, the producers of the Lingvo dictionary brand.

The new dictionary became publicly available on 12 April 2010 after a couple of testing days. It started with 77,934 entries and received 38,800 queries on 13 April 2010. As the dictionary only went online in the evening it only received 3,607 queries on its first day.<ref name="dict.leo rude"/>

Today it contains about 300,000 entries and receives an average of 370,000 queries each weekday.<ref name="dict.leo rude">((Cite web |title=Russisch ⇔ Deutsch Wörterbuch - leo.org: Statistik |url=https://dict.leo.org/pages/about/rude/statistics_de.html |access-date=2024-01-24 |website=dict.leo.org))</ref>

=== Portuguese-German ===

A dictionary for the Portuguese language was announced in early 2011 and first launched in January 2013. As of September 2018, it contains more than 100,000 entries, receiving about 210,000 queries each weekday.<ref>((Cite web |title=Portugiesisch ⇔ Deutsch Wörterbuch - leo.org: Statistik |url=https://dict.leo.org/pages/about/ptde/statistics_de.html |access-date=2024-01-24 |website=dict.leo.org))</ref>

=== Polish-German ===

In 2013, a Polish-German dictionary was started which contains over 74,000 entries by November 2019 and receives almost 80,000 queries every weekday.<ref>((Cite web |title=Polnisch ⇔ Deutsch Wörterbuch - leo.org: Statistik |url=https://dict.leo.org/pages/about/plde/statistics_de.html |access-date=2024-01-24 |website=dict.leo.org))</ref>

== History ==
The site grew out of a network of [[File Transfer Protocol|FTP]] software and archived data which was put together by students at Munich University of Technology and [[Ludwig Maximilian University of Munich]] even before [[HTML]] and [[Hypertext Transfer Protocol|HTTP]] existed. The original aim was to create a single, huge archive by linking up archives run by the different research groups (hence its name LEO – ''Link Everything Online''. The archive was sorted thematically and the different sections organised and kept up to date by archivists.

When the [[World Wide Web]] came into common use, HTTP access to the archive was at first added as an alternative to FTP. Students developed various services in their free time, in particular the dictionaries. Some services have been dropped in the course of the spin out.

==Name==
The name of the site is actually a [[backronym]] from the name Leo: the [[Bavaria]]n [[coat of arms]] features a [[lion]]. Originally, the service was named ISAR (a backronym for [[Isar]] river, on the banks of which Munich is situated; here, ISAR stood for ''Informations Systeme und Archiv München'', but it had to be renamed as there was another firm of the same name.

==References==
((Reflist))
: ''Some of this article was translated from the [[:de:Link Everything Online|German language version]] of this page.''

==External links==
* [https://dict.leo.org/ LEO's entry page]
((Authority control))

[[Category:German websites]]
[[Category:Online dictionaries]]
[[Category:German dictionaries]]

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