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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Catastrophism  \Ca*tas"tro*phism\,  n.  (Geol.) 
  The  doctrine  that  the  geological  changes  in  the  earth's  crust 
  have  been  caused  by  the  sudden  action  of  violent  physical 
  causes;  --  opposed  to  the  doctrine  of  {uniformism}.