Phonological feature in the context of "Phonological history of English"

English phonology is the system of speech sounds used in spoken English. Like many other languages, English has wide variation in pronunciation, both historically and from dialect to dialect. In general, however, the worldwide dialects of English share a largely similar (but not identical) phonological system. Among other things, most dialects have vowel reduction in unstressed syllables and a complex set of phonological features that distinguish fortis and lenis consonants (stops, affricates, and fricatives).

Phonological analysis of English often concentrates on prestige or standard accents, such as Received Pronunciation for England, General American for the United States, and General Australian for Australia. Nevertheless, many other dialects of English are spoken, which have developed differently from these standardized accents, particularly regional dialects. Descriptions of standardized reference accents provide only a limited guide to the phonology of other dialects of English.