Free and ready to run at no cost.
Based on latest edition of WordNet's lexical database.
55,000 words in 2 MB (make sure you have enough space before installing!)
Uses the Public BDicty dictionary kernel v4.5
Adjustable font sizes
Two different view modes and support for smart view for utilizing screen space and readability.
Expandable with the huge selection of other BDicty compatible dictionaries.