lexicon

noun

lex·​i·​con ˈlek-sə-ˌkän 

 also  -kən

plural lexica ˈlek-sə-kə  or lexicons

1

: a book containing an alphabetical arrangement of the words in a language and their definitions : dictionary

a French lexicon

2

a

: the vocabulary of a language, an individual speaker or group of speakers, or a subject

computer terms that have been added to the lexicon

b

: the total stock of morphemes in a language

3

: repertoire, inventory

added the DVD to his video lexicon

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Tips on Using Lexicon in a Sentence

The word lexicon has a number of closely-related meanings, which can easily lead to confusion and may cause the word to be used in an awkward way. Lexicon can refer to a general dictionary of a language (as in "a lexicon of the Hebrew language") and also to a narrower printed compilation of words within some sphere (as in "a medical lexicon" or "a lexicon of the German in Finnegans Wake").

Similarly, lexicon can refer both to the vocabulary of a specific group of people ("the lexicon of French") or to the general language used by an unspecified group of people ("a word that has not entered the general lexicon yet"). It may also often be found in reference to the vocabulary employed by a particular speaker ("'Failure' is not a word in my lexicon").

Synonyms

• dictionary
• wordbook

Examples of lexicon in a Sentence

a computer term that has entered the general lexicon

an avid word enthusiast who is compiling a lexicon of archaic and unusual words

Recent Examples on the Web

Flaherty described how Project 2025 entered our lexicon: One of the most effective messaging tools for Democrats actually came out of a comment section on a TikTok video. —Jack Schlossberg, Vogue, 24 Oct. 2024

Off-Court coaching wouldn't get into the Brash Basher of Belleville's lexicon. —Tim Ellis, Forbes, 23 Oct. 2024

Part of the lexicon of people who work in prisons, the term describes someone who knows personally, intimately, the tolls of time behind the walls. —Mitchell S. Jackson, TIME, 2 Oct. 2024

Although Desaru Coast hasn’t joined the Southeast Asian lexicon of go-to vacation spots yet, Malaysia is certainly trying to change that. —Katie Lockhart, Robb Report, 11 Oct. 2024

Word History

Etymology

Late Greek lexikon, from neuter of lexikos of words, from Greek lexis word, speech, from legein to say — more at legend

First Known Use

1580, in the meaning defined at sense 1

Kids Definition

lexicon

noun

lex·​i·​con ˈlek-sə-ˌkän 

-si-kən

: dictionary sense 1