com·pla·cen·cy

[kuhm-pley-suhn-see]
noun, plural com·pla·cen·cies.
1.
a feeling of quiet pleasure or security, often while unaware of some potential danger, defect, or the like; self-satisfaction or smug satisfaction with an existing situation, condition, etc.
2.
Archaic.
a.
friendly civility; inclination to please; complaisance.
b.
a civil act.
Also, com·pla·cence [kuhm-pley-suhns] .


Origin:
1635–45; < Medieval Latin complacentia. See complacent, -cy

non·com·pla·cence, noun
non·com·pla·cen·cy, noun, plural non·com·pla·cen·cies.
o·ver·com·pla·cence, noun
o·ver·com·pla·cen·cy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To complacency
00:10
Complacency is always a great word to know.
So is flibbertigibbet. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
complacency or complacence (kəmˈpleɪsənsɪ) [Click for IPA pronunciation guide]
 
n , pl -cencies, -cences
1.  a feeling of satisfaction, esp extreme self-satisfaction; smugness
2.  an obsolete word for complaisance
 
complacence or complacence
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

complacency
1640s, from same source as complacence but with the later form of the suffix.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The combination of awful infrastructure and overwhelming cultural complacency
  will almost surely result in endless frustration.
So my counter-hypothesis would be that it wasn't beauty that was the problem,
  it was complacency.
Highly reliable automation has been shown to induce overconfidence and
  complacency.
It has come through the tireless struggle of people who fought such complacency.
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