 A lexeme is defined as the fundamental unit of the lexicon of a language, that is, as an abstract vocabulary item which may be realized in different sets of grammatical variants. By convention, lexemes are represented in capital letters. Here is an example, the lexeme fly. And like all lexemes, fly belongs to a particular syntactic category. It has a certain meaning and in synthetic languages it has a corresponding inflectional paradigm which lists its inflectional realizations. Note that there is a second lexeme fly which belongs to the categories of verbs and involves in whatever interpretation the meaning of physical transfer from one location to another. And it has its own inflectional paradigm too. So the lexeme is an abstract head term which is associated with syntactic categories and a particular semantic interpretation and its actual realizations are word forms. The set of the inflectional variants of a lexeme constitutes the so-called paradigm. In many cases, lexemes are realized by more than just inflectional variants but include word forms associated with word formation processes. For example, the lexeme fly number 2 has such an extended set. Such a set can be referred to as word family.