vow ‧ el /ˈvaʊəl/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Language: Old French ; Origin: vouel , from Latin vocalis ; ⇨ ↑ vocal 1 ]
1 . one of the human speech sounds that you make by letting your breath flow out without closing any part of your mouth or throat
2 . a letter of the alphabet used to represent a vowel. In English the vowels are a, e, i, o, u, and sometimes y.