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The definition of lexicon

4 Definitions of: lexicon

    1. noun, a dictionary, esp one of an ancient language such as Greek or Hebrew
    2. noun, a list of terms relating to a particular subject
    3. noun, the vocabulary of a language or of an individual
    4. noun, linguistics the set of all the morphemes of a language
    5. Show me some examples of this word: lexicon
    6. Show me the etymology of the word: lexicon

From Collins