title: The Relevance of Diachronic Approach to Grammaticalization Research
abstract: The present paper proves the relevance of the diachronic approach to grammaticalization research. The article contains defi nitions of the concept of grammaticalization and makes a distinction between diachronic and historical grammar. The theoretical review is based on research carried out by such scholars as I.A. Baudouin de Courtenay, W. von Humboldt, E. Kuryłowicz, B. Heine, Ch. Lehmann, E. Traugott, J. Bybee and others. Grammaticalization is defi ned as a process whereby lexical units turn 
journal: Stephanos Peer reviewed multilanguage scientific journal