What is Commissariat?

Legal Definition
A commissariat is a department or organization commanded by a commissary or by a corps of commissaries.

In many countries, commissary is a police rank. In those countries, a commissariat is a police station commanded by a commissary.

In some armies, commissaries are logistic officers. In those countries, a commissariat is a department charged with the provision of supplies, both food and forage, for the troops. The supply of military stores such as ammunition is not included in the duties of a commissariat. In almost every army the duties of transport and supply are performed by the same corps of departmental troops.
-- Wikipedia
Legal Definition
The whole body of officers who make up the commissaries' department of an army.
-- Black's Law Dictionary
Legal Definition
(Scotch) The jurisdiction of a commissary.
-- Ballentine's Law Dictionary