The document discusses definitions of language provided by different linguists, including Sapir, Bloch and Trager, and Chomsky. It also notes defects in each definition. Sapir defined language as a human method of communicating ideas, emotions, and desires using voluntarily produced symbols. Bloch and Trager defined language as a system of arbitrary vocal symbols used for social cooperation. Chomsky defined language as a set of finite sentences constructed from a finite set of elements. However, each definition was found to neglect important aspects of language, such as its communicative function.