Plena Vortaro de Esperanto

Plena Vortaro de Esperanto (PV; English: Complete Dictionary of Esperanto) was a monolingual dictionary of the Esperanto language first published by the Sennacieca Asocio Tutmonda (SAT) in 1930, largely considered the first truly comprehensive dictionary written entirely in Esperanto. == History == French academic Émile Grosjean-Maupin was the original chief editor of the PV, with additional contributions over the years from Albert Esselin, Salomon Grenkamp-Kornfeld, and Gaston Waringhien.

Source: Wikipedia — Plena Vortaro de Esperanto (CC BY-SA 4.0)