English

vowel noun definition in Phonetics topic from the Oxford Advanced Learner's Dictionary

vowel

 noun: Phonetics topic
1 a speech sound in which the mouth is open and the tongue is not touching the top of the mouth, the teeth, etc., for example /ɑː, e, ɔː/ vowel sounds Each language has a different vowel system. This neutral vowel is known as ‘schwa’.2 a letter that represents a vowel sound. In English the vowels are a, e, i, o and u.

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