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extinguisher
extirpate
extol
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externality

ex·ter·nal·i·ty [ èkstər nállətee ] (plural ex·ter·nal·i·ties)


noun 
Definition:
 
1. quality of being external: the fact or quality of being external

2. something outside or external: an outward form or appearance, or anything that is outside or external to somebody or something

3. economics consequence of production ignored in pricing: a factor such as environmental damage that results from the way something is produced but is not taken into account in establishing the market price of the goods or materials concerned

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