Ex*ter"nal*ism (?) n.
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.
© Webster 1913.