Diccionario Salamanca de la lengua espanola

This is the most up-to-date work of its kind; it offers over 85,000 clear and precise definitions, over 10,000 locutions with their definitions, and over 60,000 examples. Questions about usage, contemporary idioms, acronyms, and synonyms are addressed and explained. It includes lexical variations, and an appendix with the conjugations of all irregular verbs.