1. [countable] (economics) a consequence of an industrial or commercial activity that affects other people or things without this being reflected in market prices
   • ● Pollution is a negative externality that imposes a cost—reduced happiness—on the victims.

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2. [uncountable] (philosophy) the fact of existing outside the person or thing that is aware of it
   • ● man’s externality to an indifferent natural world

[TahlilGaran] English Dictionary ▲