[lek-si-kon, -kuhn]
noun, plural lexica [lek-si-kuh] , lexicons.
a wordbook or dictionary, especially of Greek, Latin, or hebrew.
the vocabulary of a particular language, field, social class, person, etc.
inventory or record: unparalleled in the lexicon of human relations.
the total inventory of morphemes in a given language.
the inventory of base morphemes plus their combinations with derivational morphemes.

1595–1605; < Medieval Latin < Medieval Greek, Greek lexikón, noun use of neuter of lexikós of words, equivalent to léx(is) speech, word (see lexis) + -ikos -ic

1. glossary, thesaurus, gloss, concordance.
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World English Dictionary
lexicon (ˈlɛksɪkən)
1.  a dictionary, esp one of an ancient language such as Greek or Hebrew
2.  a list of terms relating to a particular subject
3.  the vocabulary of a language or of an individual
4.  linguistics the set of all the morphemes of a language
[C17: New Latin, from Greek lexikon, n use of lexikos relating to words, from Greek lexis word, from legein to speak]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, "a dictionary," from Mod.L., from Gk. lexikon (biblion) "word (book)," from neut. of lexikos "pertaining to words," from lexis "word," from legein "say" (see lecture). Used originally of dictionaries of Gk., Syriac, Hebrew and Arabic, since these usually were in
Latin and in Mod.L. lexicon, not dictionarius, was the preferred word. The modern sense of "vocabulary proper to some sphere of activity" (1640s) is a figurative extension.
Online Etymology Dictionary, © 2010 Douglas Harper
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