LEXICON
vocabulary, lexicon, mental lexicon
(noun) a language user’s knowledge of words
dictionary, lexicon
(noun) a reference book containing an alphabetical list of words with information about them
Source: WordNet® 3.1
Etymology
Noun
lexicon (plural lexica or lexicons)
The vocabulary of a language.
Synonyms: word-hoard, word-stock
(linguistics) A dictionary that includes or focuses on lexemes.
Synonym: wordbook
A dictionary of Classical Greek, Hebrew, Latin, or Aramaic.
(programming) The lexicology of a programming language. (Usually called lexical structure.)
(rare) Any dictionary.
The vocabulary used by or known to an individual. (Also called lexical knowledge)
A vocabulary specific to a certain subject.
Source: Wiktionary
Lex"i*con, n. Etym: [Gr. Legend.]
Definition: A vocabulary, or book containing an alphabetical arrangement of
the words in a language or of a considerable number of them, with the
definition of each; a dictionary; especially, a dictionary of the
Greek, Hebrew, or Latin language.
Source: Webster’s Unabridged Dictionary 1913 Edition