In parliamentary procedure, a voice vote (or viva voce, from the Latin, "live voice") is a voting method in deliberative assemblies (such as legislatures) in which a vote is taken on a topic or motion by responding verbally.
The voice vote, or acclamation, is considered the simplest and quickest of voting methods used by deliberative assemblies. The presiding officer or chair of the assembly will put the question to the assembly, asking first for all those in favor of the motion to indicate so verbally ("aye" or "yes"), and then ask second all those opposed to the motion to indicate so verbally ("nay" or "no"). The chair will then make an estimate of the count on each side and state what he or she believes the result to be. Since in close cases this can be imprecise, typically if there is any doubt as to the outcome any member of the assembly may request another vote by a method such as division of the assembly (a standing or rising vote), or a roll call vote. Voice votes are usually not recorded, while others are.
Voice votes are also used in non-governmental settings, such as battles of the bands and spectator sports where a most valuable player, Man of the Match or Best in Show award is chosen by the audience.
Robert's Rules of Order Newly Revised (11th edition) provides that:
A vote by voice is the regular method of voting on any motion that does not require more than a majority vote for its adoption. In taking a voice vote, the chair puts the question by saying, "The question is on the adoption of the motion to [or "that"] ... [repeating or clearly identifying the motion]. Those in favor of the motion, say aye. [Pausing for response,] Those opposed, say no." (Alternative forms are: "All those in favor..."; "All in favor..."; or the wording formerly prescribed by Congress, "As many as are in favor...") In the case of a resolution, the question may be put as follows: "The question is on the adoption of the following resolution: [reading it]. Those in favor of adopting the resolution that was just read, say aye...Those opposed, say no." If the question has been read very recently and there appears no desire to have it read again, the chair may use this form: "The question is on the adoption of the resolution last read. "Those in favor of adopting the resolution, say aye...Those opposed, say no."