- (America) IPA: /ˈɑbˌlaʊt/, /ˈɑpˌlaʊt/, /ˈæbˌlaʊt/
- (linguistics) The substitution of one root vowel for another, thus indicating a corresponding modification of use or meaning; vowel permutation; as, get and got; sing and song; hang and hung, distinct from the phonetic influence of a succeeding vowel. [Mid 19th century.]
- French: apophonie
- German: Ablaut (Vokalabstufung)
- Italian: apofonia
- Portuguese: ablaut, apofonia
- Russian: абла́ут
- Spanish: apofonía
ablaut (ablauts, present participle ablauting; past and past participle ablauted)
- (intransitive, linguistics, of a vowel-containing linguistic component) To undergo a change of vowel.
- (transitive, linguistics) To cause to change a vowel.