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.

U.S. Army RanksAn enlisted member enters the Army as a Private. After completing basic training, the enlisted recuits advances to Private First Class. The next notable advancement is …

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.

/ luˈten·ənt / Add to word list a naval officer of middle rank, above an ensign; or a military officer of the lowest rank (Definition of lieutenant from the Cambridge Academic Content Dictionary © …

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 …

Nov 4, 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 …

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

Lieutenant, junior grade (pay grade O-2), abbreviated as LTJG and sometimes referred as "JG" It is equivalent to the rank of First Lieutenant (O-2), sometimes called simply "lieutenant," in the …