Sergeant at Arms, the officer of an organization who preserves order during its meetings. A sergeant at arms functions mainly at formal gatherings, where he enforces rules of procedure; in a legislative body he also enforces executive commands. Both houses of the U.S. Congress have a sergeant at arms, as do both houses of the British Parliament.
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Mine, in warfare, an explosive charge used as a weapon on land and at sea. It is a defensive weapon used to obstruct or delay enemy movements.
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