ex·ter·nal·i·ty

[ek-ster-nal-i-tee]
noun, plural ex·ter·nal·i·ties.
1.
the state or quality of being external.
2.
something external; an outward feature.
3.
excessive attention to externals.
4.
an external effect, often unforeseen or unintended, accompanying a process or activity: to eliminate externalities such as air pollution through government regulation.

Origin:
1665–75; external + -ity

non·ex·ter·nal·i·ty, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To externality
00:10
Externality is always a great word to know.
So is gobo. Does it mean:
a scrap or morsel of food left at a meal.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
externality (ˌɛkstɜːˈnælɪtɪ) [Click for IPA pronunciation guide]
 
n , pl -ties
1.  the state or condition of being external
2.  something external
3.  philosophy the quality of existing independently of a perceiving mind
4.  an economic effect that results from an economic choice but is not reflected in market prices

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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Example sentences
Another way to look at this may be that the good or service has a positive
  externality.
Well, guess what, our society has accepted that externality in our
  transportation system.
The order flow externality results because traders offer free options to the
  market when trading.
We consider whether motorcycle helmet laws also reduce a beneficial externality
  by decreasing the pool of viable organ donors.
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