ETYM Old Eng. vois, voys, Old Fren. vois, voiz, French voix, Latin vox, vocis, akin to Greek epos voice, Skr. vac to say, to speak, German erwähnen to mention. Related to Advocate, Advowson, Avouch, Convoke, Epic, Vocal, Vouch, Vowel.
1. The ability to speak; speech.
2. A means or agency by which something is expressed or communicated.
3. A sound suggestive of a vocal utterance.
4. The sound made by the vibration of vocal folds modified by the resonance of the vocal tract; SYN. vocalization.
5. Something suggestive of speech in being a medium of expression.
6. The distinctive quality or pitch or condition of a person's speech.
7. (Linguistics) The grammatical relation of the subject of a verb to the action that the verb denotes.
8. (Metonymy) A singer.
Sound produced through the mouth and by the passage of air between the vocal cords. In humans the sound is much amplified by the hollow sinuses of the face, and is modified by the movements of the lips, tongue, and cheeks.

1. To give voice to.
2. To utter with vibrating vocal chords; SYN. sound, vocalize.

In music, the human singing voice. The voice behaves like a free-reed instrument, driven by air in the lungs pressurized by contraction of the diaphragm, and using the vocal folds, flanges of tissue in the larynx, as a flexible valve controlling the escape of air as a series of pulses. The larynx can be relaxed or tensed at will to vary the pitch. The timbre of the voice is created by the resonances of the mouth and nasal cavities.
The art of singing consists largely of training the voice to develop a pure and powerful tone. Formerly, theorists divided the voice into different registers, known as the chest voice and head voice, based on what was believed to be the physiological source of voice production. Modern vocal registers are concerned primarily with the vocal range: soprano, mezzo-soprano, and contralto (or simply alto) for women; tenor, baritone, and bass for men; and treble and alto for boys.
The term “voice” is also used to refer to the independent parts of a contrapuntal work, whether played or sung.

In grammar, the form of the verb that determines the relation between the grammatical subject and the action of the verb; see active voice and passive voice.