[mass noun] The phenomenon in some languages, e.g. Turkish, for all the vowels in a word to be members of the same subclass, for example all front vowels or all back vowels.
- ‘In Turkish, with its extensive system of vowel harmony, the above categories are more salient than they are in English, for example.’
- ‘Vowel harmony is probably the most widely known phonological characteristic of Turkic languages.’
- ‘The phenomenon of vowel harmony has attracted considerable attention among phonologists from all theoretical denominations ever since.’