Definition of officer

• n. - 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.
• n. - Specifically, a commissioned officer, in distinction from a warrant officer.
• v. t. - To furnish with officers; to appoint officers over.
• v. t. - To command as an officer; as, veterans from old regiments officered the recruits.