lexicon

UK: /ˈlɛksɪkən/ US: /ˈlɛksɪˌkɑn, -kən/ ,(lek′si kon′, -kən)

Inflections of 'lexicon' (n):

lexica

npl

lexicons

npl

WordReference Random House Learner's Dictionary of American English © 2025

lex•i•con /ˈlɛksɪˌkɑn, -kən/   n. [countable] , pl. -ca /-kə/  -cons. 

1. a list, wordbook, or dictionary of a language.
2. Linguistics the vocabulary of a particular language, field, social class, person, etc.

WordReference Random House Unabridged Dictionary of American English © 2025

lex•i•con  (lek′si kon′, -kən), n., pl. lex•i•ca (lek′si kə), lex•i•cons. 

1. a wordbook or dictionary, esp. of Greek, Latin, or Hebrew.
2. Linguistics the vocabulary of a particular language, field, social class, person, etc.
3. inventory or record:
   unparalleled in the lexicon of human relations.
4. Linguistics
   • Linguistics the total inventory of morphemes in a given language.
   • Linguistics the inventory of base morphemes plus their combinations with derivational morphemes.

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

Synonyms

• 1. glossary, thesaurus, gloss, concordance.

Collins Concise English Dictionary © HarperCollins Publishers::

lexicon / ˈlɛksɪkən/ noun

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. the set of all the morphemes of a language

Etymology: 17th Century: New Latin, from Greek lexikon, n use of lexikos relating to words, from Greek lexis word, from legein to speak