the consonant phonemes of a language, especially when considered as forming an interrelated and interacting group.
Why Are A, E, I, O, U, And Y Called “Vowels”?In elementary school, we all learned the vowels of the English language: A, E, I, O, U and sometimes Y. But, what makes a vowel a vowel?
Compare vowel system.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019