1.design features: refer to the defining properties of human language that tell the difference between human language and any system of animal communication. They are features that define our human languages, such as arbitrariness, duality, creativity, displacement, cultural transmission, etc. 2.function: the use of language to communicate, to think, etc. Language functions include informative function, interpersonal function, performative function, emotive function, phatic communion, recreational function and metalingual function.3.etic: a term in contrast with emic which originates from American linguist Pikes distinction of phonetics and phonemics. Being etic means making far too many, as well as behaviorally inconsequential, differentiations, just as was often the case with phonetic vs. phonemic analysis in linguistics proper.4.emic: a term in contrast with etic which originates from American linguist Pikes distinction of phonetics and phonemics. An emic set of speech acts and events must be one that is validated as meaningful via final resource to the native members of a speech community rather than via appeal to the investigators ingenuity or intuition alone.5.synchronic: a kind of description which takes a fixed instant (usually, but not necessarily, the present), as its point of observation. Most grammars are of this kind.6.diachronic: the study of a language which is carried through the course of its history.7.prescriptive: a kind of linguistic study in which things are prescribed how ought to be, i.e. laying down rules for language use.8.descriptive: a kind of linguistic study in which things are just described.9.arbitrariness: one design feature of human language, which refers to the face that the forms of linguistic signs bear no natural relationship to their meaning.10.duality: one design feature of human language, which refers to the property of having two levels of are composed of elements of the secondary. level and each of the two levels has its own principles of organization.11.displacement: one design feature of human language, which means human language enable their users to symbolize objects, events and concepts which are not present c in time and space, at the moment of communication.12.phatic communion: one function of human language, which refers to the social interaction of language.13.metalanguage: certain kinds of linguistic signs or terms for the analysis and description of particular studies.14.macrolinguistics: he interacting study between language and language-related disciplines such as psychology, sociology, ethnograph, science of law and artificial intelligence etc. Branches of macrolinguistics include psycholinguistics, sociolinguistics,anthropological linguistics, etc.15.competence: language users underlying knowledge about the system of rules.16.performance: the actual use of language in concrete situation.17.langue: the linguistic competence of the speaker.18.parole: the actual phenomena or data of linguistics(utterances).19Articulatory phonetics: the study of production of speech sounds.20. Coarticulation: a kind of phonetic process in which simultaneous or overlapping articulations are involved. Coarticulation can be further divided into anticipatory coarticulation and perseverative coarticulation.21Voicing: pronouncing a sound (usually a vowel or a voiced consonant) by vibrating the vocal cords.22Broad and narrow transcription: the use of a simple set of symbols in transcription is called broad transcription; the use of a simple set of symbols in transcription is called broad transcription; while, the use of more specific symbols to show more phonetic detail is referred to as narrow transcription.23Consonant: are sound segments produced by constricting or obstructing the vocal tract at some place to divert, impede, or completely shut off the flow of air in the oral cavity.24Phoneme: the abstract element of sound, identified as being distinctive in a particular language.25. Allophone: any of the different forms of a phoneme(eg.is an allophone of /t/in English. When /t/occurs in words like step, it is unaspirated.Bothand are allophones of the phoneme/t/.26. Vowel: are sound segments produced without such obstruction, so no turbulence of a total stopping of the air can be perceived.27. Manner of articulation; in the production of consonants, manner of articulation refers to the actual relationship between the articulators and thus the way in which the air passes through certain parts of the vocal tract.28. Place of articulation: in the production of consonants, place of articulation refers to where in the vocal tract there is approximation, narrowing, or the obstruction of air.29. Distinctive features: a term of phonology, i.e. a property distinguishing one phoneme from another.30. Complementary distr