Definition of officer :
1. 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.
2. Specifically, a commissioned officer, in distinction from a warrant officer.
3. To command as an officer; as, veterans from old regiments officered the recruits.
4. To furnish with officers; to appoint officers over.
aide-de-camp, lawman, policewoman, officeholder, businesswoman, ambassador, C.O., finest, functionary, bobby, brigadier, patrolman, copper, cadet, adjutant, police, brigadier-general, sheriff, businessman, cop, chief of police, businessperson, agent, chief of staff, deputy, peeler, account executive, man, flatfoot, peace officer, shamus, commissioner, Cdr., gendarme, heat, exec, patrolwoman, military officer, administrant, incumbent, bluecoat, public servant, ship's officer, constable, fuzz, Col., policeman, over, capitalist, law, colonel, police officer, bull
director (part of speech: noun)
treasurer (part of speech: noun)
master (part of speech: noun)
landlady, authority, Lord, governor, guru, senior, principal, master, sire, abbot, titleholder, chief, executive, ruler, commander, squire, dean, maestro, proprietress, captain, mahatma, commandant, president, head, star, kingpin, landlord, headmaster, quartermaster, headmistress, mother, director, manager, proprietor, mandarin, leader
- So I was glad to fall in with a young officer who was working his way up the line. - "From Bapaume to Passchendaele, 1917", Philip Gibbs.
- " Very well," said the officer. - "The Woman of Mystery", Maurice Leblanc.
- The officer so appointed may go as far as the doors of the writing- rooms when he wants to hand in or to take out a book, but he may not go inside. - "The Care of Books", John Willis Clark.