Etymology
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externality (n.)

1670s, "state of being external," from external + -ity. From 1839 as "that which is external." From 1833 as "undue regard for externals."

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Definitions of externality

externality (n.)
the quality or state of being outside or directed toward or relating to the outside or exterior;
Synonyms: outwardness
From wordnet.princeton.edu