- the quality or state of being external
- an external thing
- Econ. a cost to society, as of pollution or diminished public health, that is not accounted for in the price of a product sold to the public
- a. The condition or quality of being external or externalized.b. Something that is external.
- A cost or benefit that affects people other than those involved in the economic activity that produced it and that is not reflected in prices: pollution and other negative externalities.