Definition of lexicon noun from the Oxford Advanced Learner's Dictionary

     

    lexicon

     noun
    noun
    BrE BrE//ˈleksɪkən//
     
    ; NAmE NAmE//ˈleksɪkən//
     
    , also NAmE//ˈleksɪkɑːn//
     
     
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  1. 1(also the 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
  2. 2[countable] a list of words on a particular subject or in a language in alphabetical order a lexicon of technical scientific terms
  3. 3[countable] a dictionary, especially one of an ancient language, such as Greek or Hebrew
  4. Word Origin early 17th cent.: modern Latin, from Greek lexikon (biblion) ‘(book) of words’, from lexis ‘word’, from legein ‘speak’.
See the Oxford Advanced American Dictionary entry: lexicon