The article deals with the issues of terminology, which is a consequence of conscious influence of society on the development of language. It is highlighted that vocabulary of any language is updated due to both internal and external resources, and a life cycle of a word depends on its usage. The principles of harmonization of terminology are defined. The process of determinologization of concepts is studied and the reasons for this process are determined. The role of special and common words of the lexicon in the determinologization process is noted. The methods of calculating the frequency and weight coefficients of terms in texts are studied and analyzed (pp.92-100).