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Subscriber: null; date: 21 May 2018

Ablaut

Source:
Concise Oxford Companion to the English Language
Author(s):
Tom McArthurTom McArthur

Ablaut. 

A term used in philology for both the diachronic shifting of vowels (also known as vowel shift) and the synchronic grading of vowels (also known as vowel gradation), especially in the indo-european languages. Vowel gradation occurs in English in the formation of some irregular noun plurals (man, men; goose, geese) and some irregular verbs (sing, sang, sung; swim, swam, swum). Compare strong verb.