1》 a person who manages an organization or group of staff.
2》 a person who controls the professional activities of a performer, sports player, etc.
3》 a person in charge of the activities, tactics, and training of a sports team.
4》 Computing a program or system that controls or organizes a peripheral device or process.
5》 (in the Houses of Parliament and the US Senate) a member of a committee appointed by one house to confer with a similar committee of the other house.