4. Subdivision of business or official duty; especially, one of the principal divisions of executive government; as, the treasury department; the war department; also, in a university, one of the divisions of instructions; as, the medical department; the department of physics.
5. A territorial division; a district; especially, in France, one of the districts composed of several arrondissements into which the country is divided for governmental purposes; as, the department of the Loire.
6. A military subdivision of a country; as, the department of the Potomac.