A vowel is a speech sound made by the vocal cords. It is also a type of letter in the alphabet.
In phonethics, a vowel is a sound in spoken languagesuch as an english ah! [ɑː] or oh! [oʊ], pronounced with an open vocal track so that there is no build-up of air pressure at any point above the glottis. This contrasts with consonant, such as English sh! [ʃː], where there is a constriction or closure at some point along the vocal tract. A vowel is also understood to be syllabic: an equivalent open but non-syllabic sound is called a semivowel.
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