The textbook Basics of Lexicology represents a concise guide to the basics of lexicological theory, with addition of exercises and a key to solution. The publication is intended to be used particularly by students of English at the Faculty of Education and its composition reflects the syllabus of a semestral course. The English word-stock is described in a logical order, starting from the concept of linguistic sign, types and shifts of meaning, proceeding to word formation processes, semantic relations between lexical units, properties of individual word classes, and finishing by chapters on regional/national varieties of English and on the historical development of its lexicon.