Vowels sounds in English.

In phonetics, a vowel is a sound in spoken language, such as English ah! [ɑː] or oh! [oʊ], pronounced with an open vocal tract so that there is no build-up of air pressure at any point above the glottis. Vowel sounds pronounced together in a single syllable form .

Their counterpart sounds pronounced with a closed vocal tract are .

In common usage, vowel is sometimes used to refer to the written representation of vowel sounds (namely the letters A, E, I, O, and U, and certain uses of Y and W*), but in fact English has a very large number of vowel phonemes, and considerable variation in their presence and use from dialect to dialect.