externalism

/IH0 K S T ER1 N AH0 L IH0 Z AH0 M/
noun
  1. 1

    Excessive regard to outward acts or appearances, especially in religion.

  2. 2

    The act of judging by outward appearance or acts.

  3. 3

    The belief that only things that can be observed by senses are real.

Source: https://en.wiktionary.org/wiki/externalism