On the different approaches to definition of the notion "category"
The purpose of the article is studying the features of the language category nature. Semantics of categories often is exposed to strong influence of a contextual environment in the course of updating and, as a result, can differ considerably from lexicographic data. The category is considered from a position of semiotics construction. Determination of language essence of linguistic category, technique of identification and the description, and also various classifications of morphological (i.e. not standard) and syntactic expressed grammatical categories are well-developed questions in general. However, the author specifies the significative, reference and structural importance of grammatical category and considers the point of view that the nature of a language sign is defined not only by the relations in language system (paradigm), but also by his syntagmatic characteristics and relation to extralinguistic factors. Any grammatical category is structurally significant in respect to morphological structure of the word (lexical and grammatical) or in respect to the syntagmatic organization of syntactic structure or both to the word and syntactic structure at the same time. All grammatical categories are significative important at least in sense that any human language is, first of all, the phenomenon of consciousness, which in the course of many centuries-old use has subjected to systematization and paradigmatization the separate, sporadic meeting of linguistic and extra language facts.