Apophony

In linguistics, apophony (also known as ablaut, (vowel) gradation, (vowel) mutation, alternation, internal modification, stem modification, stem alternation, replacive morphology, stem mutation, internal inflection etc.) is any alternation within a word that indicates grammatical information (often inflectional).

This article is about Apophony as a general linguistic term. For Ablaut in a specifically Indo-European context, see Indo-European ablaut.
Not to be confused with Apophenia.
Sound change and alternation
Metathesis
Lenition
Fortition
Epenthesis
Elision
Transphonologization
Assimilation
Dissimilation
Sandhi
Synalepha
Other types
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