You can use this English dictionary and thesaurus to look up words from almost any program in just one click.
One frame displays the definition, another shows synonyms and other related words.
There are over 150,000 root words, with full coverage of American, British, Canadian and Australasian words and spellings. If you are online web reference tabs let you check online sources such as the Wikipedia encyclopedia.
Version 5 adds one-click look up, web references, bookmarks and more.