a person who defects from a cause, country, alliance, etc.

1655–65; < Latin dēfector renegade, rebel, equivalent to dēfec- (variant stem of dēficere to become disaffected, revolt, literally, to fail; see defect) + -tor -tor

nondefector, noun
redefector, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  a lack of something necessary for completeness or perfection; shortcoming; deficiency
2.  an imperfection, failing, or blemish
3.  crystallog point defect See also dislocation a local deviation from regularity in the crystal lattice of a solid
4.  (intr) to desert one's country, cause, allegiance, etc, esp in order to join the opposing forces
[C15: from Latin dēfectus, from dēficere to forsake, fail; see deficient]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1660s, from L. defector "revolter," agent noun from deficere (see deficient).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Federal investigators feared that the defector might have been punished or killed.
It is true that a defector is not necessarily a great prize in terms of what he can give.
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