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.
7.nounOne appointed as the substitute of another, and empowered to act for them, in their name or their behalf; a substitute in office"As the deputy store manager, he is able to fire staff."
8.nounA person employed to install and remove props, brattices, etc. and to clear gas, for the safety of the miners.
9.noun(France): A member of the Chamber of Deputies, formerly called Corps Législatif
10.noun(Ireland): a member of Dáil Éireann, or the title of a member of Dáil Éireann. (Normally capitalised in both cases)"At today's meeting, Deputy Ryan will speak on local issues."
11.noun(United States): a law enforcement officer who works for the county sheriff's office; a deputy sheriff or sheriff's deputy; the entry level rank in such an agency"The sheriff's deputies took the suspect into custody."