geographic provenance alone, such as speaker's birth locale, extended residence and the like". However, a sociolect's main identifier is a socioeconomic class, age, gender, and ethnicity in a certain speech community. An example of a dialectal difference, based on region, is the use of the words soda or pop and coke in different parts of the United States. As Thomas E. Murray states, "coke is used generically by thousands of people, especially in the southern half of the country." On the other hand, pop is known to be a term that is used by many citizens in the northern half of the country. An example of a sociolect difference, based on social grouping, is the zero copula in African American Vernacular English. It occurs in a specific ethnic group but in all areas of the United States. William Labov gives an example: "he here" instead of "he's here". Definitions Code switching is "the process whereby bilingual or bidialectal speakers switch back and forth between one language or dialect and another within the same conversation". Diglossia, associated with the American linguist Charles A. Ferguson, which describes a sociolinguistic situation such as those that obtain in Arabic-speaking countries and in German-speaking Switzerland. In such a diglossic community, the prestigious standard of 'High'(or H) variety, which is linguistically related to but significantly different from the vernacular or 'Low' (or L) varieties, has no native speakers. Domain is "different language, dialects, or styles are used in different social contexts". Language attitudes are "social in origin, but that they may have important effects on language behavior, being involved in acts of identity, and on linguistic change." Linguistic variable is "a linguistic unit...initially developed...in order to be able to handle linguistics variation. Variables may be lexical and grammatical, but are most often phonological". Example of British English (h) which is sometimes present and sometimes not. Pragmatics is the meaning of a word in social context, while semantics has "purely linguistic meaning". Register is "a language variety that is associated with a particular topic, subject, or activity...." Usually, it is defined by vocabulary, but has grammatical features as well. Examples Tamil caste system The following is an example of the lexical distinction between the Mudaliyar and the Iyengar groups of the Tamil-speaking people in India. The Iyengar group is part of the Brahmin caste which is scholarly and higher in the caste hierarchy than the non-Brahmin or