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Meaning of master-at-arms

mas•ter-at-arms

Pronunciation: (mas'tur-ut-ärmz', mä'stur-), [key]
— pl. mas•ters-at-arms.
  1. an officer of a fraternal organization, veterans' society, or the like, empowered to maintain order, exclude unauthorized persons, etc.
  2. a petty officer who has various duties, such as keeping order on the ship, taking charge of prisoners, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.