Definify.com
Webster 1913 Edition
Externalism
Ex-ter′nal-ism
Noun.
1.
The quality of being manifest to the senses; external acts or appearances; regard for externals.
This
externalism
gave Catholicism a great advantage on all sides. E. Eggleston.
2.
(Metaph.)
That philosophy or doctrine which recognizes or deals only with externals, or objects of sense perception; positivism; phenomenalism.