This book summarizes scholarly achievements of the author by confronting two descriptive models of linguistic research. Against the background of a language-centered view dealing with its external conditionings in the life of nations and nationalities the author puts forward a human-centered conception of grammar which focuses on the ecosystem of communicating individuals who aggregate into interpersonal and intersubjective groupings for the realization of common tasks. Such a grammar manifests itself in linguistic-communicational properties of people through changeable practices of meaning-creation and stabilizing patterns of meaning-interpretation: firstly, when they create observable relationships while transmitting and receiving the meaning-bearers, and, secondly, when they contribute to the formation of assumable associations while coding and decoding the meanings to the approximately similar extent.