Esperanto is the most widely-spoken constructed international auxiliary language. The name derives from Doktoro Esperanto, the pseudonym under which Ludwik Lejzer Zamenhof first published Unua Libro (First Book), the first book describing Esperanto. The word "esperanto" means "one who hopes" in Esperanto.
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Also known as:
- La Internacia Lingvo,
- La Lingvo Internacia