Is “Externality” a Scrabble word?
Yes
EXTERNALITY
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Externality
/ekstəˈnælɪti/
noun
1.The state of being external or externalized.
2.A thing that is external relative to something else.
3.An impact, positive or negative, on any party not involved in a given economic transaction or act.
“Waste is a negative externality arising from consumption.”