Definitions
1.nounA part, portion, or subdivision.
2.nounA distinct course of life, action, study, or the like."Technical things are not his department; he's a people person."
3.nounA subdivision of an organization.
4.nounA territorial division; a district; especially, in France, one of the districts into which the country is divided for governmental purposes, similar to a county in the UK and in the USA. France is composed of 101 départements organized in 18 régions, each department is divided into arrondissements, in turn divided into cantons.
5.nounA military subdivision of a country"the Department of the Potomac"
6.nounAct of departing; departure.