Terminology starts with a great offline U.S. English dictionary-thesaurus built around exploring word relationships. Its concise definitions are complimented by deep heirarchical information about the language – with not just synonyms and antonyms, but more and less specific terms, member/part relationships and more.
There are fair number of installable queries and more are available everyday through the action library. But why stop there. Have your way with Terminology and mold it into your own general query tool with custom URLs.
I see it like a LaunchBar for iOS.
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