The definition of a vowel is a letter representing a speech sound made with the vocal tract open, specifically the letters A, E, I, O, U.
(noun)The letter "A" is an example of a vowel.
See vowel in Webster's New World College Dictionary
noun
Origin: ME vowelle < MFr vouel < L vocalis (littera), vocal (letter), vowel < vox, voice
adjective
See vowel in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English vowelle
Origin: , from Old French vouel
Origin: , from Latin (littera) vōcālis, sounding (letter)
Origin: , from vōx, vōc-, voice; see wekw- in Indo-European roots
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