(phonetics) A vowel that is pronounced with the lips drawn together and forming a circular opening.

plural of rounded vowel

(phonetics) Any vowel sound produced in the back of the mouth, such as /uː/ in rule or /əʊ/ in pole.

(phonetics) Any vowel sound produced in the front of the mouth. Examples: "a" in “man” and "e" in “gel”

(phonology) A phonological process in some languages that sets constraints on which vowels may be found near each other or within a word, such as back vowels or front vowels; sometimes resulting in variant affixes, clitics or similar variations.

plural of nasal vowel

(phonetics) A vowel that is produced with a lowering of the velum so that air escapes both through nose as well as the mouth.

(linguistics) A vowel’s duration of articulation; its length.

In languages that distinguish vowel length, a vowel which is normally pronounced shorter than a long vowel.

In languages that distinguish vowel length, a vowel which is normally pronounced longer than a long vowel generally at least twice as long as a short vowel. Often consists of two syllables or moras.