in linguistics, a system of grammatical analysis that divides sentences into successive layers, or constituents, until, in the final layer, each constituent consists of only a word or meaningful part of a word. (A constituent is any word or construction that enters into some larger construction.) In the sentence “The old man ran away,” the first division into immediate constituents would be between “the old man” and “ran away.” The immediate constituents of “the old man” are “the” and “old man.” At the next level “old man” is divided into “old” and “man.” The term was introduced by the United States linguist Leonard Bloomfield in 1933, though the underlying principle is common both to the traditional practice of parsing and to many modern systems of grammatical analysis.