com·mis·sar·y 
(k
ŏm
ĭ-s
ĕr
′ē)
n. pl. com·mis·sar·ies 1. a. A supermarket for military personnel and their dependents, usually located on a military installation.
b. A store where food and equipment are sold, as in a mining camp.
2. A lunchroom or cafeteria, especially one in a film or television studio.
3. 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.]