Over 145,000 references with multiple detailed definitions (over 200,000). Nearly 1,200,000 relationships between definitions (synonyms, antonyms, hypernyms, hyponyms, meronyms, holonyms,...). Each definition is directly linked to its own theasurus. And much much more... what to be expected to a professional dictionary. Like "WordWeb" in many ways better than that. moreover the best is "Absolutely 100% free of charge."