Webster's Revised Unabridged Dictionary · 1913

Externalism

Externalism , 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.
(Metaphysics) That philosophy or doctrine which recognizes or deals only with externals, or objects of sense perception; positivism; phenomenalism.