Definition of Lexicon

lex·i·con
n. pl. lex·i·cons or lex·i·ca (-k)

1. A dictionary.
2. A stock of terms used in a particular profession, subject, or style; a vocabulary: the lexicon of surrealist art.
3. Linguistics. The morphemes of a language considered as a group.

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[Medieval Latin, from Greek lexikon (biblion), word(book), from neuter of lexikos, of words, from lexis, word, from legein, to speak. See leg- in Indo-European Roots.]
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Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Main Entry:	lexicon2
Part of Speech:	noun
Definition:	the vocabulary of a person, group, subject, or language; also, the total morphemes of a language
Etymology:	Greek lexis `word, phrase'

Source: Webster's New Millennium™ Dictionary of English, Preview Edition (v 0.9.6) Copyright © 2003-2005 Lexico Publishing Group, LLC