adaptationism

/AH0 D AE1 P T EY1 SH AH0 N IH1 Z AH0 M/
noun
  1. 1

    The view that many traits of organisms are evolved adaptations.

  2. 2

    A set of methods for distinguishing traits resulting from adaptation from those arising through other processes.

  3. 3

    The belief that all traits are adaptations brought about by natural selection, when some are only functionless by-products (also called "spandrels").

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