Definitions of vowel
British English : vowel A vowel is a sound such as the ones represented in writing by the letters `a', `e', `i', `o', and `u', which you pronounce with your mouth open, allowing the air to flow through it.ˈvaʊəl NOUN
noun
- (phonetics ) a voiced speech sound whose articulation is characterized by the absence of friction-causing obstruction in the vocal tract, allowing the breath stream free passage. The timbre of a vowel is chiefly determined by the position of the tongue and the lips
- a letter or character representing a vowel