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externality

[ek-ster-nal-i-tee] /ˌɛk stərˈnæl ɪ ti/
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 of externality
1665-1675
1665-75; external + -ity
Related forms
nonexternality, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for externality

externality

/ˌɛkstɜːˈnælɪtɪ/
noun (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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for externality
n.

1713, from external + -ity.

Online Etymology Dictionary, © 2010 Douglas Harper
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