Common
Indo-European ablaut
Grammatical change of vowels in Indo-European languages
Indo-European ablaut
In linguistics, the Indo-European ablaut ( AB-lowt, from German Ablaut pronounced [ˈap.laʊt]) is a system of apophony (regular vowel variations) in the Proto-Indo-European language (PIE). An example of ablaut in English is the strong verb sing, sang, sung and its related noun song, a paradigm inherited directly from the Proto-Indo-European stage of the language. Traces of ablaut are found in all modern Indo-European languages, though its prevalence varies greatly.
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