In linguistics, the lexicon (from the Greek: Λεξικόν) of a language is its vocabulary, including its words and expressions. More formally, it's a language's inventory of lexemes. The lexicon includes the lexemes used to actualize words. Lexemes are formed according to morpho-syntactic rules and express sememes. In this sense, a lexicon organizes the mental vocabulary in a speaker's mind: First, it organizes the vocabulary of a language according to certain pri… (More on Lexicon)