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.

Hence, one who betrays any confidence or trust; a betrayer.

To act the traitor toward; to betray; to deceive.

One who betrays one's country, a cause, or a trust. One who commits treason.

someone who betrays his country by committing treason

a betrayer --- one who practices injury, while professing friendship

a malevolent human citizen who has betrayed his friend The Computer and seeks to destroy The Computer, Alpha Complex, humanity and life as we know it

an evil and malevolent human who has betrayed his friend The Computer and seeks to destroy The Computer, humanity, Alpha Complex and life as we know it

a person that intentionally supports the enemies cause

a person who commits treason by betraying his or her country, not necessarily work with SL, half baked pundit and moran

One who betrays another's trust. In the Civil War, both Confederate and Union spies who stole secrets from the other side were called traitors and brought to trial for their crimes.

This term is used to describe people that are in "deep cover" or are "spies"/"espionage kingpins". This term is used in team games such as Team Fortress and Capture the Flag.