lexicon lexicology • lexiconist · · · Info · Definitions · Synonyms · Characters · · lexicon · · Text Latin · · Script 7 · · Length Definitions · · · (noun) a language user's knowledge of words. Synonyms: vocabulary, mental lexicon. · · Noun Definition 1 (noun) a reference book containing an alphabetical list of words with information about them. Synonyms: dictionary. · · Noun Definition 2 Synonyms · · · vocabulary · · Synonym 1 mental lexicon · · Synonym 2 dictionary · · Synonym 3 Characters · · c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F x latin small letter x U+0078