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Esperanto is a constructed international auxiliary language. It is the most widely spoken constructed language in the world. The Polish ophthalmologist L. L. Zamenhof published the first book detailing Esperanto, the Unua Libro, on 26 July 1887. The name of Esperanto derives fromDoktoro Esperanto ("Esperanto" translates as "one who hopes"), the pseudonym under which Zamenhof published Unua Libro.