http://dictionary.reference.com/browse/defection "de·fec·tion [dih-fek-shuhn] noun (1.) desertion from allegiance, loyalty, duty, or the like; apostasy: His defection to East Germany was regarded as treasonable. (2.) failure; lack; loss: He was overcome by a sudden defection of courage." Retrieved 22MARCH2011.
http://dictionary.reference.com/browse/defector "de·fec·tor [dih-fek-ter] –noun a person who defects from a cause, country, alliance, etc. Origin: 1655–65; < Latin dēfector renegade, rebel, equivalent to dēfec- (variant stem of dēficere to become disaffected, revolt, literally, to fail; see defect) + -tor -tor" Retrieved 22MARCH2011.
thefreedictionary.com
http://www.thefreedictionary.com/defector "de·fect (dfkt, d-fkt) n. (1.) The lack of something necessary or desirable for completion or perfection; a deficiency: a visual defect. (2.) An imperfection that causes inadequacy or failure; a shortcoming. See Synonyms at blemish. intr.v. (d-fkt) de·fect·ed, de·fect·ing, de·fects (1.) To disown allegiance to one's country and take up residence in another: a Soviet citizen who defected to Israel. (2.) To abandon a position or association, often to join an opposing group: defected from the party over the issue of free trade. [Middle English, from Latin dfectus, failure, want, from past participle of dficere, to desert, be wanting : d-, de- + facere, to do; see dh- in Indo-European roots.]" Retrieved 22MARCH2011.