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n. The quality or state of being extrinsic.

"Nevertheless, if Shoemaker's kind of case is not peculiar ” that is, if it turns out to be easy to produce multiple examples of extrinsic properties which, aside from their extrinsicness, seem as dispositional as any property can be ” then the view that dispositions must by their nature be intrinsic properties seems hard to defend."

intrinsicness   

extrinsicity    extrinsicality