Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

American Heritage Dictionary - Cite This Source - Share This

com·mis·sar·y       (kŏm'ĭ-sěr'ē)  Pronunciation Key  n.   pl. com·mis·sar·ies A supermarket for military personnel and their dependents, usually located on a military installation. A store where food and equipment are sold, as in a mining camp. A lunchroom or cafeteria, especially one in a film or television studio. A person to whom a special duty is given by a higher authority; a deputy. [Middle English commissarie, agent, from Medieval Latin commissārius, from Latin commissus, entrusted; see commission.]

Online Etymology Dictionary - Cite This Source - Share This
commissary 

WordNet - Cite This Source - Share This

commissary
noun
1.	a retail store that sells equipment and provisions (usually to military personnel)
2.	a snack bar in a film studio

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Commissary

Com"mis*sa*ry\, n.; pl. Commissaries. [LL. commissarius, fr. L. commissus, p. p. of committere to commit, intrust to. See Commit.]

1. One to whom is committed some charge, duty, or office, by a superior power; a commissioner.

Great Destiny, the Commissary of God. --Donne.

2. (Eccl.) An officer of the bishop, who exercises ecclesiastical jurisdiction in parts of the diocese at a distance from the residence of the bishop. --Ayliffe.

3. (Mil.) (a) An officer having charge of a special service; as, the commissary of musters. (b) An officer whose business is to provide food for a body of troops or a military post; -- officially called commissary of subsistence. [U. S.]

Washington wrote to the President of Congress . . . urging the appointment of a commissary general, a quartermaster general, a commissary of musters, and a commissary of artillery. --W. Irving

Commissary general, an officer in charge of some special department of army service; as: (a) The officer in charge of the commissariat and transport department, or of the ordnance store department. [Eng.] (b) The commissary general of subsistence. [U. S.]

Commissary general of subsistence (Mil. U. S.), the head of the subsistence department, who has charge of the purchase and issue of provisions for the army.