O (nie)stabilności kategorii językowych

The paper looks into certain issues connected with the functioning of language categories which appear on a grammatical — semantic level of Slavonic languages. There grammatical — semantic categories undergo changes in four directions i. e. extend their range — they undergo 1) the process of morphology derivation, 2) the process of semantic derivation, 3) the process of gramaticalization, 4) the process of lexicalization