Definition of lexicon in English:

lexicon

Pronunciation /ˈleksiˌkän/ /ˈlɛksɪˌkɑn/ /ˈleksiˌkən/ /ˈlɛksɪˌkən/

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noun

  • 1The vocabulary of a person, language, or branch of knowledge.

    • ‘the size of the English lexicon’
    lexicon, word stock, lexis
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    1. 1.1A dictionary, especially of Greek, Hebrew, Syriac, or Arabic.
      • ‘a Greek–Latin lexicon’
      dictionary, wordbook, vocabulary list, glossary, wordfinder
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    2. 1.2Linguistics The complete set of meaningful units in a language.

Origin

Early 17th century modern Latin, from Greek lexikon (biblion) ‘(book) of words’, from lexis ‘word’, from legein ‘speak’.