externalism Meaning, Definition & Usage

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.

Webster 1913