For a topical guide of this subject, see Outline of linguistics

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Linguistics is the scientific study of language. Specific areas of linguistic description and analysis are syntax (rules governing the structure of sentences), semantics (meaning), morphology (structure of words), phonetics (speech sounds and equivalent manual gestures in sign languages), phonology (the abstract sound system of a particular language, and analogous systems of sign languages), and pragmatics (how the context of use contributes to meaning). Subdisciplines such as biolinguistics (the study of the biological variables and evolution of language) and psycholinguistics (the study of psychological factors in human language) bridge many of these divisions.

These various branches and subfields span both theoretical and practical applications. Theoretical linguistics is concerned with explaining the universal and fundamental nature of language and developing a general framework for describing it. Applied linguistics seeks to use the findings of the scientific study of language for practical purposes, such as developing methods of improving language education and literacy. Mathematical linguistics is the application of mathematics to model phenomena and solve problems in general linguistics and theoretical linguistics. Computational linguistics is an interdisciplinary field concerned with the computational modelling of natural language, as well as the study of appropriate computational approaches to linguistic questions.

Linguistic features may be studied through a variety of perspectives: synchronically (by describing the structure of a language at a specific point in time) or diachronically (through the historical development of a language over a period of time), in monolinguals or in multilinguals, among children or among adults, in terms of how it is being learnt or acquired, as abstract objects or as cognitive structures, through written texts or through oral elicitation, and finally through mechanical data collection or practical fieldwork.

Linguistics emerged from the field of philology, of which some branches are more qualitative and holistic in approach. Today, philology and linguistics are variably described as related fields, subdisciplines, or separate fields of language study. But, by and large, linguistics can be seen as an umbrella term. Linguistics is also related to the philosophy of language, stylistics, rhetoric, semiotics, lexicography, and translation. (Full article...)

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Ain't is a contraction for am not, is not, are not, has not, and have not in the common English language vernacular. In some dialects ain't is also used as a contraction of do not, does not, and did not. The development of ain't for the various forms of to be not, to have not, and to do not occurred independently, at different times. The usage of ain't for the forms of to be not was established by the mid-18th century, and for the forms of to have not by the early 19th century.

The usage of ain't is a perennial subject of controversy in English. Ain't is commonly used by many speakers in oral or informal settings, especially in certain regions and dialects. Its usage is often highly stigmatized, and it may be used as a marker of socio-economic or regional status or education level. Its use is generally considered non-standard by dictionaries and style guides except when used for rhetorical effect, and it is rarely found in formal written works.

Did you know...

From Wikipedia's "Did You Know" archives:

The number 605 in Khmer Numerals

... that the world's largest mathematical experiment, designed by Brian Butterworth, found women to be faster than men at subitizing?
... that Khmer numerals were the first material evidence of the figure zero as a numerical figure?
... that in the English plural, the letter -s is pronounced differently in words like "cats", "cabs", and "buses", because of a phonological rule?
...that the 2005 movie The Interpreter by film director Sydney Pollack was based on real-life conference interpreters from the United Nations Interpretation Service?
... that Samuel Taylor Coleridge spelled William Shakespeare's last name as "Shakspere"?