WordNet (r) 3.0 (2006):
sergeant at arms n 1: an officer (as of a legislature or court) who maintains order and executes commands [syn: sergeant at arms, serjeant-at-arms]Bouvier's Law Dictionary, Revised 6th Ed (1856):
SERGEANT AT ARMS, An officer appointed by a legislative body, whose duties are to enforce the orders given by such bodies, generally under the warrant of its presiding officer.