Meaning of ablaut

ab•laut

Pronunciation: (äb'lout, ab'- Ger. äp'lout), [key]
— n. Gram.
  1. (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; apophony.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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