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.

In English, lieutenant is best known as a military title, but the word is still sometimes used in its original meaning to refer to a person who acts in lieu of someone else.

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.

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

A lieutenant is a junior officer in the army, navy, or air force. The lieutenant ordered the man to stop.

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

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

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 …

A lieutenant is a commissioned officer in the armed forces or the police who can take command if her higher-ups aren't around. Lieutenant is pronounced "loo-TEN-unt."

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 …