(eks′tər nal′ə tē)
- the quality or state of being external
- pl. externalities an external thing
See externality in American Heritage Dictionary 4
noun pl. ex·ter·nal·i·ties
- The condition or quality of being external or externalized.
a. Something that is external.
b. An incidental condition that may affect a course of action: “Our economic system treats environmental degradation as an externality—a cost that does not enter into the conventional arithmetic that determines how we use our resources” (Barry Commoner).
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