Other forms: commissioners
The noun commissioner refers to someone in charge of a formal group or organization, such as a police commissioner or a baseball commissioner.
As you might guess, commissioner is related to commission, which describes a group that carries out a particular function. Commissioner can describe an official who directs or regulates a commission, or it can be that person's title. For example, if Theodore Young is the housing commissioner, in formal situations you’d refer to him as Commissioner Young.