Officer/ˈɑːfɪsər/ Definition 1 of 4Pro Tip 1/3Military Rank Indicates rank and duties in service like the army or navy. The officer commanded his troops during the drill. Pro Tip 2/3Respect & Authority Officers often require formal respect and are addressed by their rank. Yes, Captain, the officer will oversee the operation. Pro Tip 3/3Not Enlisted Ranks Different from enlisted personnel; officers usually have higher education. He graduated from the academy as a commissioned officer.