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English definition of “umlaut”

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umlaut

noun [C] uk   /ˈʊm.laʊt/ us  
a mark put over a vowel in some languages, such as German, to show that the pronunciation of the vowel is changed: The German word "Gebäude", which means "building", has an umlaut over the "a".
(Definition of umlaut from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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