The document discusses definitions of language from various sources. It provides definitions that view language as a systemic set of arbitrary symbols used for human communication within a community or culture. The definitions also note that language symbols can be vocal or visual. The document then discusses key aspects of language, including that it is a system that allows for combining smaller units into larger ones for communication purposes. It also notes language has multiple functions like social interaction and transmitting information. The document explores theories around the origin of language and physiological adaptations that enabled language development. It discusses language as having rules and patterns at various linguistic levels. It also addresses concepts like language universals, the innateness of language, and its creative aspects. In the end, it frames