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Definitions of ablaut

  1. a vowel whose quality or length is changed to indicate linguistic distinctions (such as sing sang sung song) Scrapingweb Dictionary DB
  2. 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. Webster Dictionary DB
  3. ab'lowt, n. (philol.) vowel permutation, a substitution of one root vowel for another in derivation, as in sing, sang, song, sung, distinct from the phonetic influence of a succeeding vowel, as in the Umlaut. It is especially the change of a vowel to indicate tense-change in strong verbs. [Ger., from ab, off, and laut, sound.] gutenberg.org/ebooks/37683
  4. (or as German), n. Systematic vowel change in derivation, as in sing, sang, sung. [German] Concise Oxford Dictionary
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