A lexicon is the vocabulary of a language or subject. "No-hitter," "go-ahead run," and "Baltimore chop" are part of the baseball lexicon.

Lexicons are really dictionaries, though a lexicon usually covers an ancient language or the special vocabulary of a particular author or field of study. In linguistics, the lexicon is the total stock of words and word elements that carry meaning. Lexicon is from Greek lexikon (biblion) meaning "word(book)," ultimately going back to legein, "to speak."

Definitions of lexicon

n a reference book containing an alphabetical list of words with information about them

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bilingual dictionary
a dictionary giving equivalent words in two languages
collegiate dictionary, desk dictionary
an abridged dictionary of a size convenient to hold in the hand
etymological dictionary
a dictionary giving the historical origins of each word
a geographical dictionary (as at the back of an atlas)
learner's dictionary, school dictionary
a dictionary specially written for those learning a foreign language
little dictionary, pocket dictionary
a dictionary that is small enough to carry in your pocket
spell-checker, spelling checker
an electronic dictionary in a word processor that can be used to catch misspelled words
unabridged, unabridged dictionary
a dictionary that has not been shortened by the omitting terms or definitions; a comprehensive dictionary
Type of:
a reference book containing words (usually with their meanings)

n a language user's knowledge of words

mental lexicon, vocabulary
Type of:
cognition, knowledge, noesis
the psychological result of perception and learning and reasoning

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