The senior grade of lieutenant is known as first lieutenant in the United States, and as lieutenant in the United Kingdom and the rest of the English-speaking world.

Lieutenant, company grade officer, the lowest rank of commissioned officer in most armies of the world. The lieutenant normally commands a small tactical unit such as a platoon.

So a lieutenant is a placeholder, one who takes the place or of or is deputy to a superior officer. In non-military contexts, lieutenant is a synonym of assistant or deputy. In the U.S. military, a lieutenant in …

LIEUTENANT definition: 1. (the title of) an officer of middle rank in the armed forces: 2. (the title of) an officer of…. Learn more.

Definition of lieutenant noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

If you refer to someone as a person's lieutenant, you mean they are that person's assistant, especially their main assistant, in an organization or activity. He was my right-hand man, my lieutenant on the …

Dec 22, 2025 · (military, US) In the US Army, Air Force and Marines, holding the rank above second lieutenant and below captain. Both ranks may be referred to as " lieutenant" or as the complete forms …

lieutenant noun A person who holds a position auxiliary to another and assumes some of the superior's responsibilities:

A lieutenant is a junior commissioned officer rank in the armed forces of many nations, as well as fire services, emergency medical services, security services ...

Military rank is more than just who salutes whom. Military rank is a badge of leadership. Responsibility for personnel, equipment, and mission grows with each increase in rank.