A majority of an entire body; e.g., a quorum of a legislative assembly.
A quorum is the minimum number of people who must be present to pass a law, make a judgment, or conduct business. Quorum requirements typically are found in a court, legislative assembly, or corporation (where those attending might be directors or stockholders). In some cases, the law requires more people than a simple majority to form a quorum. If no such defining number is determined, a quorum is a simple majority.
A quorum also might mean the number of members of a body defined as competent to transact business in the absence of the other members. The purpose of a quorum rule is to give decisions made by a quorum enough authority to allow binding action to be conducted.
In both houses of Congress, a quorum consists of a simple majority of members.