Meaning of provost sergeant

pro'vost ser"geant

Pronunciation: (prō'vō), [key]
— Mil. Mil.
  1. the senior noncommissioned officer of a prison or other confinement facility whose chief duty is the supervision of prisoners and of the military police unit.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.