Etymology
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traitor (n.)

c. 1200, "one who betrays a trust or duty," from Old French traitor, traitre "traitor, villain, deceiver" (11c., Modern French traître), from Latin traditor "betrayer," literally "one who delivers," agent noun from stem of tradere "deliver, hand over," from trans- "over" (see trans-) + dare "to give" (from PIE root *do- "to give"). Originally usually with a suggestion of Judas Iscariot; especially of one false to his allegiance to a sovereign, government, or cause from late 15c. Compare treason, tradition.

updated on May 15, 2018

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Definitions of traitor from WordNet

traitor (n.)
someone who betrays his country by committing treason;
Synonyms: treasonist
traitor (n.)
a person who says one thing and does another;
Synonyms: double-crosser / double-dealer / two-timer / betrayer
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.