Two dictionaries issued by the official language authority of Spain. The Diccionario de Autoridades was published from 1726-1739 and the latest edition of the Diccionario de la Real Academia Espa??ola (or Diccionario "usual") was published in 1992. Both dictionaries are fully searchable. Results are displayed on scanned pages of the dictionaries, so surrounding words can also be seen. A useful resource for studying the history of the Spanish language.