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ablaut

linguistics
Also known as: vowel gradation

Quick Summary

Ablaut is a systematic variation of vowels within a root or affix, primarily observed in Indo-European languages. This linguistic phenomenon is crucial for understanding word formation and inflection, particularly in verbs. For instance, the English words sing, sang, and sung demonstrate ablaut, where the vowel changes to signify different grammatical forms or meanings.1

In Proto-Indo-European, the reconstructed parent language of many modern languages, vowels participated in ablaut alternations. These alternations included different "grades" such as the e-grade, o-grade, and zero-grade, which could appear during inflection and word formation. The concept of ablaut was notably introduced by Jacob Grimm in the 19th century. A related linguistic term, "umlaut," refers to a vowel change caused by assimilation to a succeeding sound or a diacritical mark.213

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