noun
a phonetic phenomenon in which vowel sounds change within a root or word to indicate changes in tense, aspect, or mood
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The linguist explained the concept of ablaut in great detail during the lecture.
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I still can't wrap my head around the whole ablaut thing in language class.
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Ablaut sounds like some crazy language voodoo to me.
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The changing vowel sounds in the word 'sing', 'sang', and 'sung' demonstrate ablaut in action.