What is vowel? 1) a speech sound which is produced by comparatively open configuration of the vocal tract, with vibration of the vocal cords but without audible friction, and which is a unit of the sound system of a language that forms the nucleus of a syllable.
2) a basic speech sound in which the breath is at least partly obstructed and which can be combined with a vowel to form a syllable.
3) is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
4) are the symbols used to represent individual phoneme sounds in transcription, e.g. in a dictionary.
