departmentde·part·ment /dɪˈpɑːtmənt-ɑːr-/ written abbreviation Dept., or dept. noun [countableC]1ORGANIZATIONSone of the parts of a large organization such as a company or university where people do a particular kind of workShe heads the customer services department.
the Department of Genetic Research
→ see also Banking Department → bank trust department2one of the parts that a government is divided into, which has a particular area of responsibilitythe Department of Employment
the Justice Department
3a part of a large shop that sells a particular type of productJoan works in the toy department.
4one of the areas that some countries, for example France, are divided into 5be somebody’s department spoken to be something that a particular person is responsible forUpdating the website isn’t really my department, ask Bill.