WordReference Random House Learner's Dictionary of American English © 2015
trai•tor /ˈtreɪtɚ/USA pronunciation   n. [countable]
  1. one who betrays.
trai•tor•ous, adj. 

WordReference Random House Unabridged Dictionary of American English © 2015
trai•tor  (trātər), 
  1. a person who betrays another, a cause, or any trust.
  2. a person who commits treason by betraying his or her country.
  • Latin trāditōr-, stem of trāditor betrayer. See traditor
  • Old French
  • Middle English 1175–1225

Collins Concise English Dictionary © HarperCollins Publishers::

traitor /ˈtreɪtə/ n
  1. a person who is guilty of treason or treachery, in betraying friends, country, a cause or trust, etc
Etymology: 13th Century: from Old French traitour, from Latin trāditor traditor

ˈtraitorous adj ˈtraitress fem n

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