One who holds an office; a person lawfully invested with an office, whether civil, military, or ecclesiastical; as, a church officer; a police officer; a staff officer.

In the Merchant Navy, crew member, other than the Master, holding a Certificate of Competency. This could be a Deck or Engineering Officer.

a member of a police force; "it was an accident, officer"

a member of a group typically in the areas of military , policing , or some other form of authority

a member of a military or naval service who holds a position of responsibility

a member of the Association of Chemical Professionals of Alberta (ACPA), which has a code of ethics as a Professional Chemist (P

a person with a special rank or authority in the army , navy, air force, police force or customs service

A member of the military holding a rank above that of cadet or midshipman.

A member of SIS staff. Often confused in popular vocabulary with agent.

Any member of the fire service with supervisory responsibilities, company-officer level and above.

any of the licensed members of the ship's complement.