Ablaut Definition

äblout, äp-
noun
Patterned change of base vowels in forms of a word or in related words to show changes in tense, meaning, etc., as in the Indo-European languages (Ex.: drink, drank, drunk)
Webster's New World

(linguistics) The substitution of one root vowel for another, thus indicating a corresponding modification of use or meaning; vowel permutation; as, get, gat, and got; sing and song; hang and hung, distinct from the phonetic influence of a succeeding vowel. [Mid 19th century.]

Wiktionary
verb
(intransitive, linguistics, of a vowel-containing linguistic component) To undergo a change of vowel.
Wiktionary
(linguistics) To cause to change a vowel.
Wiktionary

Other Word Forms of Ablaut

Noun

Singular:
ablaut
Plural:
ablauts

Origin of Ablaut

  • German ab off (from Middle High German ab, abe) (from Old High German aba apo- in Indo-European roots) Laut sound (from Middle High German lūt) (from Old High German hlūt kleu- in Indo-European roots)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From German Ablaut (“off-sound”), from ab (“off”), + Laut (“sound”).

    From Wiktionary

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ablaut