Systematic variation/gradation of vowels in a word element, reflecting a change in grammatical function (e.g. sing, sang, sung, song).

Definition of ablaut from Merriam-Webster:


  • 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)


history | excerpt history