ABSTRACT
In historical linguistics, the study of the diachronic process(es) of change in language elements and language systems ( diachronic linguistics). Language change takes place on all levels of linguistic description: (a) in phonology, depending on conditioning factors, a distinction is drawn between phonetic and phonological change and changes motivated by analogy or by extralinguistic factors ( sound change). (b) In morphology, a distinction is drawn between changes in the inflectional system and changes in word formation. (i) In inflectional morphology, such processes involve the occurrence and classification of morphological categories (e.g. in the development of the Indo-European languages several categories have disappeared: most frequently the dual, but also case, gender, mood, and tense differentiations); on the other hand, the realization of different categories has been retained, for example, by substituting inflected forms for periphrastic forms ( periphrasis). (ii) In word formation, language change concerns above all the change from compositional to derivational regularities ( composition, derivation) as well as the process of back formation. (c) In syntax, language change involves, among other things, regularities in word and phrase order ( word order). In such cases, there is an interrelation between the changes on the individual levels (e.g. the phonological decay of case endings from Old English to Middle English which led to fundamental changes in English morphology and syntax; syncretism) that results in an increase in stricter rules for word and phrase order. (d) In semantics, semantic change and borrowing.
