Definition of vowel noun from the Oxford Advanced American Dictionary

     

    vowel

     noun
    noun
    NAmE//ˈvaʊəl//
     
    (phonetics)
     
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  1. 1a speech sound in which the mouth is open and the tongue is not touching the top of the mouth, the teeth, etc., for example/ɑ, ɛ, ɔ/ vowel sounds Each language has a different vowel system. see also cardinal vowel
  2. 2 a letter that represents a vowel sound. In English the vowels are a, e, i, o, and u. compare consonant, diphthong
See the Oxford Advanced Learner's Dictionary entry: vowel

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