allophone1 Syllabification: (al·lo·phone)Pronunciation: /ˈaləˌfōn/Definition of allophone noun Linguistics any of the speech sounds that represent a single phoneme, such as the aspirated k in kit and the unaspirated k in skit, which are allophones of the phoneme k. Derivatives allophonicPronunciation: /ˌaləˈfänik/ adjective Origin: 1930s: from allo- 'other, different' + phonemeallophone in other Oxford dictionaries Definition of allophone in the British & World English dictionary