lexicon

[lek-si-kon, -kuhn]
noun, plural lexica [lek-si-kuh] , lexicons.
1.
a wordbook or dictionary, especially of Greek, Latin, or hebrew.
2.
the vocabulary of a particular language, field, social class, person, etc.
3.
inventory or record: unparalleled in the lexicon of human relations.
4.
Linguistics.
a.
the total inventory of morphemes in a given language.
b.
the inventory of base morphemes plus their combinations with derivational morphemes.

Origin:
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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
lexicon (ˈlɛksɪkən)
 
n
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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Dictionary.com's 21st Century Lexicon
Main Entry:  lexicon1
Part of Speech:  n
Definition:  a word book describing language with definitions; dictionary
Etymology:  Greek lexis 'word, phrase'
Main Entry:  lexicon2
Part of Speech:  n
Definition:  the vocabulary of a person, group, subject, or language; also, the total morphemes of a language
Etymology:  Greek lexis 'word, phrase'
Main Entry:  lexicon3
Part of Speech:  n
Definition:  repertoire; compendium
Etymology:  Greek lexis 'word, phrase'
Dictionary.com's 21st Century Lexicon
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Etymonline
Word Origin & History

lexicon
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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Example sentences
There is a word in there that you might want to add to your lexicon.
Small wonder that the word karaoke began to seem as much a part of the global
  lexicon as--well, car and okay.
Thirty-five years ago, those fish names didn't exist in our cultural lexicon.
The company's speech-recognition model has acoustic, lexicon and language
  components.
Images for lexicon
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