Is called lexeme to minimum unit which has lexical meaning despite not having grammatical morphemes or dispensing with them through a segmentation mechanism. The term is used in the field of linguistics .
The lexemes and the morphemes (units that have grammatical meaning) are the components of words. While lexemes provide the idea that is understandable to people, morphemes complement lexemes with indications about number, gender, etc.
In a family of words, the usual thing is that the lexeme is the part that is repeated. Take the case of shoe and of words linked as shoe shop , Shoemaker or shoe . The lexeme, in this case, is zapat- (shoe , shoe shop , Shoemaker , zapat-azo ). There is the lexical meaning (a shoe with a sole at the bottom, which does not exceed the ankle height)
It can be said, in short, that lexama is the root of the term. It is the segment that carries the meaning and does not vary.
In some cases, the lexeme is classified as independent since it does not appear next to a morpheme. Tree is a independent lexeme which also constitutes a word . If the lexeme is used together with one or more morphemes, it receives the qualification of dependent .
Let's look at the example of home . His lexical family includes words like cottage , mansion , home and hamlet . The lexeme, as you can see, is cas- (home , cottage , cas-erón , home , hamlet ). The lexical meaning, in this context, refers to a construction destined to living place .