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[ahb-lout, ab-; German ahp-lout] /ˈɑb laʊt, ˈæb-; German ˈɑp laʊt/
noun, Grammar
(in Indo-European languages) regular alternation in the internal phonological structure of a word element, especially alternation of a vowel, that is coordinated with a change in grammatical function or combination, as in English sing, sang, sung, song; apophony.
1840-50; < German, equivalent to ab- off + Laut sound Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ablaut


/ˈæblaʊt; German ˈaplaut/
(linguistics) vowel gradation, esp in Indo-European languages See gradation (sense 5)
Word Origin
German, coined 1819 by Jakob Grimm from ab off + Laut sound
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for ablaut

"systematic vowel alteration in the root of a word to indicate shades of meaning or tense," a characteristic of Indo-European languages, 1849, from German Ablaut, literally "off-sound," coined by J.P. Zweigel in 1568 from ab "off" + Laut "sound, tone," from Old High German hlut (see listen). Popularized by Jacob Grimm.

Online Etymology Dictionary, © 2010 Douglas Harper
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