Could you please provide a Simple definition of a vowel?

Answer 1

A speech sound, created by the relatively free passage of breath through the larynx and oral cavity, usually forming the most prominent and central sound of a syllable. A letter, such as a, e, i, o, u, and sometimes y in the English alphabet, that represents a vowel.

Answer 2

A vowel is a speech sound produced by the free flow of breath through the mouth, with no stricture or closure to impede the airflow. In English, the letters a, e, i, o, u, and sometimes y are considered vowels. Vowels are contrasted with consonants in the formation of syllables and words.