I-mutation (also known as umlaut, front mutation, i-umlaut, i/j-mutation or i/j-umlaut) is a type of sound change in which a back vowel is fronted or a front vowel is raised if the following syllable contains /i/, /iː/ or /j/ (a voiced palatal approximant, sometimes called yod, the sound of English ⟨y⟩ in yes). It is a category of regressive metaphony, or vowel harmony.
I-mutation (also known as umlaut, front mutation, i-umlaut, i/j-mutation or i/j-umlaut) is a type of sound change in which a back vowel is fronted or a front vowel is raised if the following syllable contains /i/, /iː/ or /j/ (a voiced palatal approximant, sometimes called yod, the sound of English ⟨y⟩ in yes). It is a category of regressive metaphony, or vowel harmony.
Source: Wikipedia "I-mutation" · CC BY-SA 4.0
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