Chapter Three Lexicon Morphology 4 Lexeme(词位) a In order to reduce the ambiguity of the term word, the term lexeme is used by some linguists to refer to the minimal distinctive unit in the semantic system of a language. The lexeme is thus postulated as the abstract unit underlying such sets of grammatical variants as walk, walks, walking, walked, or big, bigger, biggest. Idiomatic phrases, by this definition, are also considered lexemes (eg. kick the bucket(=“lie”), a Lexemes are the units which are conventionally listed in dictionaries as separate entriesChapter Three Lexicon & Morphology *4 Lexeme(词位)  In order to reduce the ambiguity of the term word, the term lexeme is used by some linguists to refer to the minimal distinctive unit in the semantic system of a language. The lexeme is thus postulated as the abstract unit underlying such sets of grammatical variants as walk, walks, walking, walked, or big, bigger, biggest. Idiomatic phrases, by this definition, are also considered lexemes (e.g. kick the bucket (= “die”)).  Lexemes are the units which are conventionally listed in dictionaries as separate entries