traitor

noun

trai·​tor ˈtrā-tər 

1

: one who betrays another's trust or is false to an obligation or duty

2

: one who commits treason

Synonyms of traitor

• betrayer
• snake

Examples of traitor in a Sentence

She has been called a traitor to the liberal party's cause.

He was a traitor who betrayed his country by selling military secrets to the enemy.

Recent Examples on the Web

His tenure was upended by the arrest of Aldrich Ames, a CIA traitor. — Bob Drogin, Washington Post, 22 July 2026

In reality, the big debate has been about questions such as whether military bases should be named for traitors and whether governments should host monuments to a rebellion to defend slavery. — David A. Graham, The Atlantic, 21 July 2026

Those who opposed the coup, like Tom Keith's grandfather, are still often thought of as traitors, just as his distant relatives are. — Lee Cowan, CBS News, 12 July 2026

Irina and Raskova will enjoy a long, successful professional collaboration, purging Star City of traitors and threats and bringing down Petrovsky in a plot that leads to his ending his life in ignominy, having confessed to crimes against the state. — Sophie Brookover, Vulture, 10 July 2026

Word History

Etymology

Middle English traytour, from Anglo-French traitre, from Latin traditor, from tradere to hand over, deliver, betray, from trans-, tra- trans- + dare to give — more at date

First Known Use

13th century, in the meaning defined at sense 1

Phrases Containing traitor

• turn traitor

Rhymes for traitor

• cater
• crater
• frater
• freighter
• gator
• grater
• greater
• hater
• krater
• later
• plater
• prater

Kids Definition

traitor

noun

trai·​tor ˈtrāt-ər 

1

: one who betrays another's trust or is false to an obligation or duty

2

: one who commits treason

Etymology

Middle English traitre "traitor," from early French traitre (same meaning), from Latin traditor (same meaning), derived from tradere "to hand over, betray" — related to treason see Word History at treason