Final answer:
The chair can adjourn a meeting without a formal vote if the entire agenda is completed, according to common parliamentary procedures and provided there are no objections. This is particularly true in bodies like the U.S. Congress, where adjournment doesn't require a vote unless extending over three days or changing location.
Step-by-step explanation:
If the entire agenda is completed at a meeting, according to common parliamentary procedures, the chair can adjourn the meeting without a formal vote. This is often true in various deliberative assemblies, including legislative bodies, committees, and formal meetings. However, the specific rules can vary depending on the bylaws or standing orders of the organization or assembly in question. In cases where there are no set rules or tradition leaving this action to the discretion of the chair, then they may adjourn the meeting without a vote.
In the context of the United States Congress, as per the Constitution and the rules that govern the proceedings, certain actions require the concurrence of both the Senate and the House of Representatives. However, in the matter of adjournment, the Constitution allows each house to adjourn on their own accord without the need for approval from the other chamber, unless they are adjourning for more than three days or to a different location. Therefore, if the agenda has been completed and there are no objections, the chair of the meeting has the authority to adjourn without seeking a vote.