The branch of lexicology that is devoted to the study of meaning is known as Semasiology. Semasiology is a branch of linguistics concerned with the meaning of words and word equivalents. The main objects of semasiological study are as follows: types of lexical meaning, polysemy and semantic structure of words, semantic development of words, the main tendencies of the change of word-meanings, semantic grouping in the vocabulary system, i.e. synonyms, antonyms, semantic fields