WordReference Random House Unabridged Dictionary of American English © 2017
Dar•win•ism  (därwə niz′əm),USA pronunciation n. 
  1. Biologythe Darwinian theory that species originate by descent, with variation, from parent forms, through the natural selection of those individuals best adapted for the reproductive success of their kind.
Darwin•ist, Dar•win•ite  (därwə nīt′),USA pronunciation n., adj.  Dar′win•istic, adj. 
  • 1855–60; Darwin + -ism

Collins Concise English Dictionary © HarperCollins Publishers::

Darwinism /ˈdɑːwɪˌnɪzəm/, Darwinian theory n
  1. the theory of the origin of animal and plant species by evolution through a process of natural selection

ˈDarwinist, ˈDarwinite n , adj

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