Definition of "ablaut" in Englisch

noun

1. (phonology) The substitution of one root vowel for another, thus indicating a corresponding modification of use or meaning; vowel permutation, distinct from the phonetic influence of a succeeding vowel.

verb

1. (intransitive, linguistics, of a vowel-containing linguistic component) To undergo a change of vowel.

2. (transitive, linguistics) To cause to change a vowel.