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    Speakers use a finite set of rules to produce and understand an infinite set of possible sentences. These rules comprise the grammar of a language, which is learned when you acquire the language and includes the sound system, the structure of words, how words may be combined into phrases and sentences, the ways in which sounds and meanings are related, and the words or lexicon. The sounds and meanings of these words are related in an arbitrary fashion. And so are the gestures used by deaf signers. Language, then, is a system that relates sounds (or hand and body gestures) with meanings; when you know a language you know this system.

FROMKIN, V., Rodman, R., Hyams, N. An Introduction to Language. 10th edition Wadsworth Cengage. Learning. 2013. Adaptado