What is the study of the development of language and how people use language to communicate

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Take a look at this online dictionary entry. language etymology middle english language, from old french language, from latin lingua ("tongue, speech, language”). noun 1. a form of communication using words either spoken or gestured with hands and structured with grammar, often with a writing system. 2. the ability to communicate using words. 3. nonverbal communication. 4. the vocabulary and usage in a particular field. 5. the words used in speech or a passage of text. 6. spoken or written words. which link would readers of this dictionary entry click if they wanted more information about the historical origins of the word "language”?