Externalism /(?)/

Ex·ter·nal·ism

Externalism

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