lieutenant

American  

[loo-ten-uhnt, lef-ten-uhnt] / luˈtɛn ənt, lɛfˈtɛn ənt /

noun

1. Military.

   1. first lieutenant.

   2. second lieutenant.

2. U.S. Navy. a commissioned officer ranking between lieutenant junior grade and lieutenant commander.

3. a person who holds an office, civil or military, in subordination to a superior they act for.

   If he can't attend, he will send his lieutenant.

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lieutenant British  

/ luːˈtɛnənt, lɛfˈtɛnənt /

noun

1. a military officer holding commissioned rank immediately junior to a captain

2. a naval officer holding commissioned rank immediately junior to a lieutenant commander

3. an officer in a police or fire department ranking immediately junior to a captain

4. a person who holds an office in subordination to or in place of a superior

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Other Word Forms

• lieutenancy noun
• underlieutenant noun

Etymology

Origin of lieutenant

First recorded in 1325–75; Middle English from Middle French, noun use of adjective phrase lieu tenant “place-holding”; see locum tenens, lieu, tenant

Explanation

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." If you're confused about all those vowels, blame the French, because the word comes from the French words lieu, meaning "place," and tenant meaning "holding." A lieutenant is someone who holds the place of authority for the person who really has it. If you start a super secret club, you should choose someone to be the lieutenant who can run meetings when you're not there.

Example Sentences

Fairfax was once considered a rising star in the Democratic Party, after he was elected Virginia’s lieutenant governor in 2017, making him only the second African American elected to statewide office.

From Salon • Apr. 16, 2026

Fairfax, a former federal prosecutor, served as lieutenant governor under Democratic Gov. Ralph Northam from 2018 to 2022.

From The Wall Street Journal • Apr. 16, 2026

The world's first helicopter rescue took place a year later, when a US lieutenant rescued four soldiers from behind Japanese lines, according to Smithsonians Air & Space Magazine.

From BBC • Apr. 3, 2026

David, whose name I’ve changed because he is still serving, is a lieutenant colonel and physician in the Army Reserve.

From Slate • Apr. 1, 2026

The firemen retreated back through the archway into the living room, and there, suddenly, the lieutenant thought to himself, There’s something wrong.

From "Blink" by Malcolm Gladwell