A voice is the sound, or the whole body of sounds, made or produced by the vocal organs of man or animals in their natural action; esp. sound formed in or emitted from the human larynx in speaking, singing, or other utterance; vocal sound as the vehicle of human utterance or expression.
To voice can be exercising control or influence over, some particular matter; part or share in the control, government, or deciding of something. A voice is also an expression of opinion, choice, or preference uttered or given by a person; a single vote or decision.