pos>n. 1. The quality of being manifest to the senses; external acts or appearances; regard for externals. [ 1913 Webster ]

This externalism gave Catholicism a great advantage on all sides. E. Eggleston. [ 1913 Webster ]

2. (Metaph.) That philosophy or doctrine which recognizes or deals only with externals, or objects of sense perception; positivism; phenomenalism. [ 1913 Webster ]