com·plex·i·ty

[kuhm-plek-si-tee]
noun, plural com·plex·i·ties for 2.
1.
the state or quality of being complex; intricacy: the complexity of urban life.
2.
something complex: the complexities of foreign policy.

Origin:
1715–25; complex + -ity

in·ter·com·plex·i·ty, noun, plural in·ter·com·plex·i·ties.
o·ver·com·plex·i·ty, noun
su·per·com·plex·i·ty, noun, plural su·per·com·plex·i·ties.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
complexity (kəmˈplɛksɪtɪ) [Click for IPA pronunciation guide]
 
n , pl -ties
1.  the state or quality of being intricate or complex
2.  something intricate or complex; complication

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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00:10
Complexity is always a great word to know.
So is bezoar. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

complexity
1721, "composite nature," from complex (adj.) + -ity. Meaning "intricacy" is from 1790. As a noun, from 1794.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

complexity definition

algorithm
The level in difficulty in solving mathematically posed problems as measured by the time, number of steps or arithmetic operations, or memory space required (called time complexity, computational complexity, and space complexity, respectively).
The interesting aspect is usually how complexity scales with the size of the input (the "scalability"), where the size of the input is described by some number N. Thus an algorithm may have computational complexity O(N^2) (of the order of the square of the size of the input), in which case if the input doubles in size, the computation will take four times as many steps. The ideal is a constant time algorithm (O(1)) or failing that, O(N).
See also NP-complete.
(1994-10-20)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Complexity researchers who study the behavior of stock markets may have
  identified a signal that precedes crashes.
The magazine's lists are pretend science, far from reflecting the complexity of
  their agenda.
Something this sophisticated indicates that there were probably lots of
  different mechanisms of similar complexity at that time.
Protein folding has never been simulated because of the computational
  complexity of the process.
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