ablaut

ablaut

[ahb-lout, ab-; German ahp-lout]
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.

Origin:
1840–50; < German, equivalent to ab- off + Laut sound

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ablaut (ˈæblaʊt, German ˈaplaut)
 
n
linguistics See gradation vowel gradation, esp in Indo-European languages
 
[German, coined 1819 by Jakob Grimm from ab off + Laut sound]

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Word Origin & History

ablaut
vowel gradation, 1849, from Ger. Ablaut, lit. "off-sound," coined by J.P. Zweigel in 1568 from ab "off" + Laut "sound, tone," from O.H.G. hlut (see listen). Popularized by Jacob Grimm.
Online Etymology Dictionary, © 2010 Douglas Harper
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