2 definitions found From WordNet (r) 2.0 [wn]: ablaut noun: a vowel whose quality or length is changed to indicate linguistic distinctions (such as sing sang sung song) From The Collaborative International Dictionary of English v.0.44 [gcide]: Ablaut \Ab"laut\, noun [Ger., off-sound; ab off + laut sound.] (Philol.) The substitution of one root vowel for another, thus indicating a corresponding modification of use or meaning; vowel permutation; as, get, gat, got; sing, song; hang, hung. --Earle.

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