Here are entered works on switching from one language to another by bilingual members of a speech community. Works on the simultaneous coexistence of two forms of the same language in a speech community are entered under the heading Diglossia (Linguistics). Works on using more than one writing system simultaneously are entered under the heading Script switching (Linguistics).
Here are entered works which compare or contrast two or more languages with the aim of finding principles which can be applied to practical problems in language teaching and translation. Works which compare languages or groups of languages for the specific purpose of determining their common origin, or discuss the method of their comparison, as represented by 19th century comparative philology and its subsequent developments, are entered under the heading Comparative linguistics.
Here are entered works on the simultaneous coexistence of two forms of the same language in a speech community. Works on switching from one language to another by bilingual members of a speech community are entered under the heading Code switching (Linguistics).
Here are entered works which describe the functional differentiation of one linguistic unit from another. The term is usually applied in phonology, where phonemes may be defined in terms of groups of specific phonetic properties, such as voice; or acoustic criteria, such as sonority.