Thomas Wilhelm, A Military Dictionary and Gazetteer
“ A name given to the organized system whereby armies are provided with food and daily necessaries. In the old Roman armies the duty of supplying troops was performed by the quæstors, who filled the place of the commissary officers of our own times. In the U. S. service this department is under charge of an officer of the rank of brigadier-general, called the commissary-general of subsistence.Commissary. In general means any one to whom the power or authority of another is committed; used in military affairs in relation to officers who have charge of the subsistence of troops, musters, etc. ”
