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English definition of “vowel”

vowel

noun [C]  /ˈvɑʊ·əl/ us  
writing a speech sound produced by human beings when the breath flows out through the mouth without being blocked by the teeth, tongue, or lips writing A vowel is also a letter that represents a sound produced in this way: The vowels in English are a, e, i, o, u, and sometimes y.
(Definition of vowel from the Cambridge Academic Content Dictionary © Cambridge University Press)
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