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ablaut

[ahb-lout, ab-; German ahp-lout] /ˈɑb laʊt, ˈæb-; German ˈɑp laʊt/
noun, Grammar
1.
(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.
Origin
1840-1850
1840-50; < German, equivalent to ab- off + Laut sound
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British Dictionary definitions for ablaut

ablaut

/ˈæblaʊt; German ˈaplaut/
noun
1.
(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
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Word Origin and History for ablaut
n.

"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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