externality

[ek-ster-nal-i-tee]
noun, plural externalities.
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

nonexternality, noun
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World English Dictionary
externality (ˌɛkstɜːˈnælɪtɪ)
 
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
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Example sentences
The nonprofit also recommends taxing the externalities produced by large-scale,
  environmentally damaging agribusinesses.
The word is externalities, a concept that holds that money is not the only
  scarcity in the world.
From an economic perspective, it is a network externalities story and a
  credible one.
All of which is another way of saying that your neighbors cause externalities.
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