- 1the lexicon [singular] (linguistics) all the words and phrases used in a particular language or subject; all the words and phrases used and known by a particular person or group of people the lexicon of finance and economics
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- 2[countable] a list of words on a particular subject or in a language in alphabetical order a lexicon of technical scientific terms
- 3[countable] a dictionary, especially one of an ancient language, such as Greek or Hebrew
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