This series of dictionaries offers a wealth of lexical and grammatical information to students of a wide ability range with roughly 40,000 entries in the "Diccionario básico" to more than 150,000 in its advanced counterpart.

Each dictionary is printed in a clear, legible typeface and most definitions are supported by helpful examples of usage in context. Other features include key notes on orthography, morphology, pronunciation, locutions, syntax, semantics and usage, synonyms, neologisms, and relevant encyclopedic information.

A clever cross-reference system points the student to related entries and an appendix at the back of each dictionary includes regular and irregular verb tables, information on accentuation, punctuation, abbreviations, acronyms, suffixes, pronouns and scientific and technical symbols.