Vortaro de Esperanto

The first edition of the Vortaro de Esperanto was published in 1911, the second in 1922 and the third in 1925 (they were, in truth, merely reprints).

Overall 8500 copies of the dictionary were printed; the book was 175 pages long.

The only Esperanto dictionary published previously had been the Plena Vortaro, an Esperanto–Esperanto and Esperanto–French dictionary published in 1909 by Émile Boirac; nevertheless, it contained somewhat imprecise definitions in its monolingual section.

Esperantologists consider the Vortaro de Esperanto a valuable source of information about the Esperanto of the early 20th century, given the presence of many archaisms and old-fashioned meanings of words.

However, the dictionary lacks any etymological references to the first use of a word and does not mention whether or not a word was personally introduced to the language by Zamenhof, or possibly even mentioned in his Fundamento de Esperanto.