The idea of the anthropocentrism of language has become a key one in modern linguistics. Within the framework of the anthropocentric paradigm, special attention is paid to the mutual influence of language and human thinking. In this regard, there is a need to consider morphological categories in close connection with cognitive activity, the processes of conceptualization, and categorization. The paper represents cognitive linguistics, one of the most relevant areas of modern science today. The categorization of human experience is connected with the cognitive activity of a person since information received by a person in the course of mastering the surrounding world finds its expression in linguistic forms. The article considers grammatical categories and their content aspect as a result of conceptualization and categorization. The formation of the cognitive direction in Kazakh linguistics is represented by the works of Y. Altynsarin, A. Baitursynov, K. Zhubanov, K. Kemengerov, and other scientists. It is possible to define the part that creates the conceptual dimension of morphology. However, it cannot be an independent part, outside the framework of the conceptual system. In cognitive linguistics, vocabulary, semantics, morphology, and syntax are considered in unity. They define the general positions inherent in human thinking. Grammar as a cognitive system is a factor that determines the conceptual structure of a language. Categorical meanings become the basis of the semantics of words and are reflected within the form; therefore, conceptual categories form grammatical categories. Grammatical categories as morphological indicators acquire an independent meaning.