The dictionary presents information about human language, linguistics as a science. His articles reveal the features of the sound, grammatical, lexical system of languages, talk about the theories of the origin of language, the laws of its development. Information about languages of the world, about families and groups of languages, about writing and history of writing. Information on different stages of development of linguistics, its main schools, directions, sections. Indexes are given. The dictionary is designed for linguists, teachers and philological students, specialists in related linguistic sciences and anyone interested in the language.