'Vowel' definitions:

Definition of 'vowel'

From: WordNet
noun
A speech sound made with the vocal tract open [syn: vowel, vowel sound] [ant: consonant]
noun
A letter of the alphabet standing for a spoken vowel

Definition of 'Vowel'

From: GCIDE
  • Vowel \Vow"el\, n. [F. voyelle, or an OF. form without y, L. vocalis (sc. littera), from vocalis sounding, from vox, vocis, a voice, sound. See Vocal.] (Phon.) A vocal, or sometimes a whispered, sound modified by resonance in the oral passage, the peculiar resonance in each case giving to each several vowel its distinctive character or quality as a sound of speech; -- distinguished from a consonant in that the latter, whether made with or without vocality, derives its character in every case from some kind of obstructive action by the mouth organs. Also, a letter or character which represents such a sound. See Guide to Pronunciation, [sect][sect] 5, 146-149. [1913 Webster]
  • Note: In the English language, the written vowels are a, e, i, o, u, and sometimes w and y. The spoken vowels are much more numerous. [1913 Webster]
  • Close vowel. See under Close, a.
  • Vowel point. See under Point, n. [1913 Webster]

Definition of 'Vowel'

From: GCIDE
  • Vowel \Vow"el\, a. Of or pertaining to a vowel; vocal. [1913 Webster]