The original word base of Esperanto contained around 900 root words and was defined in Unua Libro ("First Book"), published by L. L. Zamenhof in 1887. In 1894, Zamenhof published the first Esperanto dictionary, Universala vortaro ("International Dictionary"), which was written in five languages and supplied a larger set of root words, adding 1740 new words.
The original word base of Esperanto contained around 900 root words and was defined in Unua Libro ("First Book"), published by L. L. Zamenhof in 1887. In 1894, Zamenhof published the first Esperanto dictionary, Universala vortaro ("International Dictionary"), which was written in five languages and supplied a larger set of root words, adding 1740 new words.
Source: Wikipedia "Esperanto vocabulary" · CC BY-SA 4.0
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