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
It is perhaps the strongest instance of his externality.
Well, guess what, our society has accepted that externality in our
  transportation system.
Externality costs for coal are a large undefined risk.
The authors also note the potential for a positive externality.
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