Definition: Dept (noun) 1. A division of a body, as the department of labor or agriculture. 2. The area of study or work done under an authority; a sub-department. Definition: Dept is a type of subdivision in a body. It is usually defined as a division or part of a body of some sort, where certain functions are assigned to its members, like the department of a university, the department of a company, the department of a museum etc. The main function of a department would be to perform tasks within that group. For example: 1. A Department of Research - This is a division of the University where students and faculty members conduct research and develop new ideas. 2. A Department of Education - In this department, educators and school administrators work together to improve educational systems. In short, dept is a division or sub-committee within a body that performs specific tasks or duties.