A word can have more than just one vowel. "a vowel" suggests that "finding any vowel is enough to pronounce the word in question", which we know can't be right. e.
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A word can have more than just one vowel. "a vowel" suggests that "finding any vowel is enough to pronounce the word in question", which we know can't be right.
Using the, on the other hand, would make sense only if you already knew which vowel to look for (i.e. you have some previous context).