Larousse Gran Diccionario Usual de La Lengua Espanola

For the intermediate to advanced Spanish-speaker, this is the ideal desktop
Spanish-language dictionary. Available in a convenient paperback format, this handy reference includes more than 70,000 entries and 144,000 meanings, with clearly labeled senses and meanings specific to Latin America.
An introductory section on basic usage and parts of speech as well as tables of verb conjugations provide a quick answer to any grammar question. Additionally, bold, easy-to-read labels at each entry clearly indicate parts of speech, subject area, and level of formality.