The Diccionario de la lengua española (a.k.a. DRAE or Diccionario de la Real Academia Española) is the standard dictionary of Spanish (a.k.a. Castilian) edited and produced by the Royal Spanish Academy (RAE is the acronym in Spanish). Its first edition dates from 1780, and its latest one is the 22nd ed. published in 2001. This online version is comprised of the 22nd edition plus some of the work done for the 23rd edition, which will be published in 2014. DRAE is considered the most authoritative dictionary for the Spanish language. It includes commonly used words in any of the Spanish speaking countries. It also includes numerous archaic and unusual words with aims of understanding ancient Spanish literature.
Diccionario de la Lengua Española 22a. ed.