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1. Linguistics: Linguistics is generally defined as the scientific study of language.2. general linguistics: The study of language as a whole.3. applied linguistics: the application of linguistic theories and principles to language teaching, especially the teaching of foreign and second languages.4. prescriptive: If linguistic study aims to lay down rules for “correct and standard” behavior in using language, ,it is said to be prescriptive.( . to tell people what they should and should not say).5. descriptive: If a linguistic study aims to describe and analyze the language people actually use, it is said to be descriptive.(09C)6. synchronic study: The description of language at some point of time in history is a synchronic study. (06C/ 04) 7. diachronic study: It’s a historical study of language,it studies the historical development of language over a period of time. (06C)8. langue: Lange refers to the abstract linguistic system shared by all the members of a speech munity.9. parole :Parole refers to the realization of langue in actual use.10. petence : The ideal user’s knowledge of the rules of his language.(08F/09C)linguistic petence: universally found in the grammars of all human languages, syntactic rules prise the system of internalized linguistic knowledge of a language speaker. 11. performance : The actual realization of th