Editing Unua Libro (section)

{{Short description|Pamphlet by L. L. Zamenhof that introduces the language Esperanto}}
{{Infobox book
| italic title   =
| name           = Unua Libro
| image          = Dr. Esperanto's International Language cover page.jpg
| image_size     =
| alt            =
| caption        = ''Dr. Esperanto's International Language''<br />(1889 Geoghegan translation)
| author         = [[L. L. Zamenhof]]
| audio_read_by  = [http://librivox.org/dr-esperantos-international-language-introduction-and-complete-grammar-by-ll-zamenhof/ Nicholas James Bridgewater] ([[LibriVox]])
| title_orig     = Международный языкъ
| orig_lang_code = ru
| title_working  =
| translator     = Julian Steinhaus (1888)<br />[[Richard H. Geoghegan|Richard Geoghegan]] (1889)<br />Henry Phillips Jr. (1889)
| illustrator    =
| cover_artist   =
| country        =
| language       = [[Russian language|Russian]], [[Esperanto]]
| series         =
| release_number =
| subject        = [[Esperanto]], [[international auxiliary language]]
| genre          =
| set_in         =
| publisher      = Chaim Kelter
| publisher2     =
| pub_date       = {{OldStyleDate|July 26|1887|July 14}}
| english_pub_date =
| published      = [[Warsaw]], [[Congress Poland]], [[Russian Empire]]
| media_type     =
| pages          = 42
| awards         =
| isbn           =
| isbn_note      =
| oclc           =
| dewey          =
| congress       =
| preceded_by    =
| followed_by    = [[Dua Libro]]
| native_wikisource = Международный язык (Заменгоф)
| wikisource     =  Dr. Esperanto's International Language
| notes          =
| exclude_cover  =
| website        =
}}
{{Esperanto sidebar |expanded=History}}

'''''Dr. Esperanto's International Language'''''{{refn|''Dr. Esperanto's International Language'' is the title of the 1889 Geoghegan translation, the standard English translation. Other titles of English translations include '''''Dr. Esperanto's International Tongue''''', the 1888 Steinhaus translation, and '''''An Attempt towards an International Language''''', the 1889 Phillips translation.|group=n}} ({{langx|ru|[[wikt:международный#Russian|Международный]] [[wikt:язык#Russian|язык]]}}), commonly referred to as '''''{{Langx|eo|Unua Libro|links=no|label=none}}''''' (''First Book''), is an 1887 book by Polish ophthalmologist [[L. L. Zamenhof]], in which he first introduced and described the [[constructed language]] [[Esperanto]].<ref name="natgeo">{{cite web |url=http://www.nationalgeographic.org/thisday/jul26/unua-libro-en-esperanto-first-book-esperanto/ |title=1887: Unua Libro en Esperanto (First Book in Esperanto) |website=NationalGeographic.org |access-date=October 19, 2017 |archive-url=https://web.archive.org/web/20171020135352/https://www.nationalgeographic.org/thisday/jul26/unua-libro-en-esperanto-first-book-esperanto/ |archive-date=October 20, 2017 |url-status=dead }}</ref> First published in Russian on {{OldStyleDate|July 26|1887|July 14}}, the publication of ''Unua Libro'' marks the formal beginning of the [[Esperanto movement]].<ref name="natgeo"/>

Writing under the pseudonym "Dr. Esperanto", Zamenhof originally referred to the language as the ''international language''; the use of ''Esperanto'' did not arise until 1889 when people began to use his pseudonym as the name of the language itself. Zamenhof reproduced a significant portion of the content of ''Unua Libro'' in the 1905 ''[[Fundamento de Esperanto]]'', which he established as the sole obligatory authority over Esperanto in the [[Declaration of Boulogne]], ratified by the first [[World Esperanto Congress]] later that year.<ref name="olga">{{cite web|url=http://blogs.bl.uk/european/2013/07/la-unua-libro.html |title=La Unua Libro |author=Kerziouk, Olga |website=Blogs.BL.UK |access-date=November 16, 2017}}</ref>