a person holding a position of authority, especially one with a commission, in the armed services, the mercantile marine, or on a passenger ship

he is also a serving officer in the army

a holder of a public, civil, or ecclesiastical office

a probation officer

the Chief Medical Officer

a member of a certain grade in some honorary orders, such as the grade next below commander in the Order of the British Empire

provide with military officers

the aristocracy wielded considerable power, officering the army