Lexeme

A lexeme (/ˈlɛksiːm/ (listen)) is a unit of lexical meaning that underlies a set of words that are related through inflection. It is a basic abstract unit of meaning, a unit of morphological analysis in linguistics that roughly corresponds to a set of forms taken by a single root word. For example, in English, run, runs, ran and running are forms of the same lexeme, which can be represented as RUN.A language's lexemes are often composed of smaller units with individual meaning called morphemes, according to root morpheme + derivational morphemes + suffix (not necessarily in that order):