Vowel (noun)

1. A speech sound made with the vocal tract open, with no restriction or obstruction of the airflow.
2. A letter representing a vowel sound, such as a, e, i, o, or u in the English alphabet.

Origin:

From the latin word "vocalis" meaning "vocal, relating to the voice".

Examples:

1. The word "dog" has one vowel and two consonants.
2. The long vowel sound in the word "bee" is represented by the letter "e".
3. The vowel sounds in the word "cat" are pronounced differently in some languages.
4. The language has a rich set of vowel sounds.
5. The vowel sounds are typically more sonorous than the consonant sounds.