traitor Meaning, Definition & Usage

  1. noun someone who betrays his country by committing treason
    treasonist.
  2. noun a person who says one thing and does another
    double-crosser; betrayer; double-dealer; two-timer.

WordNet

Trai"tor noun
Etymology
OE. traitour, OF. traïtor, traïteur, F. treître, L. traditor, fr. tradere, traditum, to deliver, to give up or surrender treacherously, to betray; trans across, over + dare to give. See Date time, and cf. Betray,Tradition, Traditor, Treason.
Definitions
  1. One who violates his allegiance and betrays his country; one guilty of treason; one who, in breach of trust, delivers his country to an enemy, or yields up any fort or place intrusted to his defense, or surrenders an army or body of troops to the enemy, unless when vanquished; also, one who takes arms and levies war against his country; or one who aids an enemy in conquering his country. See Treason.
    O passing traitor, perjured and unjust! Shak.
  2. Hence, one who betrays any confidence or trust; a betrayer. "This false traitor death." Chaucer.
Trai"tor adjective
Definitions
  1. Traitorous. R. Spenser. Pope.
Trai"tor transitive verb
Definitions
  1. To act the traitor toward; to betray; to deceive. Obs. " But time, it traitors me." Lithgow.

Webster 1913