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[dis-loi-uh l-tee] /dɪsˈlɔɪ əl ti/
noun, plural disloyalties.
the quality of being disloyal; lack of loyalty; unfaithfulness.
violation of allegiance or duty, as to a government.
a disloyal act.
Origin of disloyalty
late Middle English
1400-50; late Middle English < Middle French desloiaute, Old French desleaute, equivalent to desleal disloyal + -te -ty2
1. faithlessness, subversion. Disloyalty, perfidy, treachery, treason imply betrayal of trust. Disloyalty applies to any violation of loyalty, whether to a person, a cause, or one's country, and whether in thought or in deeds: to suspect disloyalty in a friend. Perfidy implies deliberate breaking of faith or of one's pledges and promises, on which others are relying: It is an act of perfidy to cheat innocent people. Treachery implies being secretly traitorous but seeming friendly and loyal: In treachery deceit is added to disloyalty. Treason is performing overt acts to help the enemies of one's country or government: Acting to aid a hostile power is treason. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for disloyalty


noun (pl) -ties
the condition or an instance of being unfaithful or disloyal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for disloyalty

early 15c., from Middle French desloyaulte, from Old French desloiaute, desleauté "disloyalty, faithlessness, marital infidelity," from desloial (see disloyal). Especially of allegiance to a state or sovereign since c.1600.

Online Etymology Dictionary, © 2010 Douglas Harper
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