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These letters are called vowels because their sounds are produced by the unobstructed passage of air through the mouth. It is the vocal cords that give the sound to the breath ('voice' it). The positions of the tongue and lips determine which vowel sound is produced.

In English, every word must contain at least one vowel (which may be 'y' as well as the five listed above).

The word 'vowel' derives from the Latin 'vocalis', which in turn derives from 'vox'/'vocis' (voice).

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14y ago
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AnswerBot

3d ago

A, E, I, O, and U are called vowels because they are speech sounds produced without any constriction or closure in the vocal tract. When pronounced, the airflow is unobstructed, allowing the sound to be produced without friction. This distinguishes vowels from consonants, which involve some degree of constriction when pronounced.

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Q: Why are a e i o u called vowels?
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