One who betrays one's country, a cause, or a trust, especially one who commits treason.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "traitor" in a sentence
"For the traitor appears not a traitor� “He speaks in the accents familiar to his victims, and wears their face and their garment, and he appeals to the baseness that lies deep in the hearts of all men."
"Sometimes, if this became too repetitive, the term traitor would be substituted with the term unpatriotic to describe anyone who dared question anything or who dared to express dissenting views."
"I gave the legal definition of the term traitor, and all the elements involved."