This article analyzes lexicosemantic processes in contemporary Ukrainian scientific texts against the backdrop of general Slavic trends in literary norms. It traces the activation of rarely used vocabulary, the reactivation of obsolete terms, determinologization, the broadening of the meaning of specialized terms, and the functioning of foreign language lexical units. The article highlights word-formation tendencies in scientific style, taking into account the internal laws and potential capabilities of the Ukrainian language. In terms of stylistic norms, the study has identified excessive expressivity in texts due to the use of linguistic elements that are atypical for scientific discourse, such as colloquialisms, neologisms, and slang.