Dictionary

1. Book defining words of any language in alphabetic order; often giving also their derivation and pronunciation. It may be confined to one language, or translate from one into another, as Greek-Latin or French English. The Homeric lexicon of A poll on i us, ab. A. D. 1, is the oldest known. 2. Encyclopædia of information in a single field, as law, biography, anatomy, or hymnology. These are modern.