The Free Dictionary Definitions Spanish (es.thefreedictionary). Includes several as medical, legal / financial and legal or several languages, including English, French, Portuguese or Japanese. Also encyclopedia.
Wordreference with definition, synonym and search engine to conjugate any verb.
List of irregular verbs wiktionary with pronunciation, etymology, meanings (transitive and intransitive verb), conjugation and translation.
And now with history sought definitions in different dictionaries.
Free access online.