Common
Apophony
Sound change within a word that indicates grammatical information
Apophony
In linguistics, apophony is an alternation of vowel (quality) within a word that indicates grammatical information (often inflectional). It is also known as ablaut, (vowel) gradation, (vowel) mutation, alternation, internal modification, stem modification, stem alternation, replacive morphology, stem mutation, or internal inflection.
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