The article deals with the functioning and word-building potential of prepositives of quantitative- evaluative semantics as part of the Ukrainian vocabulary. The peculiarities of lexeme adapting to the word-building system of the Ukrainian language and participation in word-building processes were clarified based on the definite lexemes.It is traced that lexicon dynamics is caused not only by the vocabulary showing new realities and concepts of social life, their features and processes with them, but also by the vocabulary, the appearance of which in the modern active Ukrainian vocabulary forced by an ever deeper and more extensive change of the language norms, communicative speakers’ guides. The development of society is manifestly and clearly comes out in the lexical-semantic aspect of word-building, in particular, in the replenishment of word-building types with new derivative words, in activating definite semantic classes of vocabulary and derived stems. Various means of word-formation with foreign language prepositive or postpositive components are described.