externality

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noun ex·ter·nal·i·ty \ˌek-ˌstər-ˈna-lə-tē\

Definition of externality

plural

externalities

  1. 1 :  the quality or state of being external or externalized

  2. 2 :  something that is external

  3. 3 :  a secondary or unintended consequence pollution and other externalities of manufacturing

1673

First Known Use of externality

1673

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