Definitions of supervisor
a body (=a group of people who perform a specific function) that checks compliance (=acting in accordance with a requirement) with specific rules
A common banking supervisor - the European Central Bank - will be given the power to monitor the health of all the major banks within the eurozone.
a person who is in charge of a department or other unit
Police claim the advertising was endorsed by the premises supervisor.
a person who is in charge of a specific employee
The social worker's supervisor and other more experienced colleagues failed to identify potential difficulties.