[lex.i.con] n, pl lex.i.ca or lexicons [LGk lexikon, fr. neut. of lexikos of words, fr. Gk lexis word, speech, fr. legein to say--more at legend] (1603) 1: a book containing an alphabetical arrangement of the words in a language and their definitions: dictionary
2. a: the vocabulary of a language, an individual speaker or group of speakers, or a subject b: the total stock of morphemes in a language
3: repertoire, inventory