lexicon
US /ˈlek.sɪ.kɑːn/
UK /ˈlek.sɪ.kɑːn/
1.
the vocabulary of a person, language, or branch of knowledge
:
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The legal lexicon can be difficult for laypeople to understand.
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She has an impressive lexicon of scientific terms.
2.
a dictionary, especially of an ancient language such as Greek or Hebrew
:
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He spent years compiling a comprehensive lexicon of ancient Greek.
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The scholar consulted a Hebrew lexicon for his research.