Abstract
Lexica - semantic system of a language - a system of vocabulary of a given language, a set of elements that are in regular relationships and form an integrity.Terminology is not just a lexical and semantic system; it is also a language system. Terms during their application undergo a certain change. They are not some special words; terms are special lexical units that have the properties to name and define something. Therefore, all the processes that occur in colloquial speech during communication between people are also characteristic of terms. Regarding this topic, one can name such features of terms as polysemy, homonymity, synonymy, anonymity. Such semantic processes in the terminological vocabulary have their own distinctive features that are absent in the general literary vocabulary.