Definition of ABLAUT
- a variation in root vowels of verb forms [n -S]
- a patterned change in root vowels of verb forms [n ABLAUTS]
- (in Indo-European languages) regular alternation in the internal phonological structure of a word element, esp. alternation of a vowel, that is coordinated with a change in grammatical function or combination, as in English sing, sang, sung, song;
- a systematic variation of vowels in the same root or affix or in related roots or affixes especially in the Indo-European languages that is usually paralleled by differences in use or meaning (as in sing, sang, sung, song)
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