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ab·laut  audio  (äblout, äp-) KEY 

NOUN:
A vowel change, characteristic of Indo-European languages, that accompanies a change in grammatical function; for example, i, a, u in sing, sang, sung. Also called gradation.

ETYMOLOGY:
German : ab, off (from Middle High German ab, abe, from Old High German aba; see apo- in Indo-European roots) + Laut, sound (from Middle High German lt, from Old High German hlt; see kleu- in Indo-European roots)


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