lieutenant

noun
  1. A commissioned officer in the armed forces, typically ranking below a captain and above a second lieutenant in the army, or below a lieutenant commander in the navy. noun
    The lieutenant was responsible for leading the platoon into battle.
    After years of service, she was promoted from second lieutenant to first lieutenant.
  2. A deputy or substitute acting for a superior, especially in a military or administrative context. noun
    The general's lieutenant handled the day-to-day operations while he was away.
    As the CEO's lieutenant, he was trusted with making important decisions in her absence.