1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Epidemic  \Ep`i*dem"ic\,  Epidemical  \Ep`i*dem"ic*al\,  a.  [L. 
  epidemus  Gr  ?,  ?,  among  the  people,  epidemic;  ?  in  +  ? 
  people:  cf  F.  ['e]pid['e]mique.  Cf  {Demagogue}.] 
  1.  (Med.)  Common  to  or  affecting  at  the  same  time,  a  large 
  number  in  a  community;  --  applied  to  a  disease  which 
  spreading  widely,  attacks  many  persons  at  the  same  time; 
  as  an  epidemic  disease;  an  epidemic  catarrh,  fever,  etc 
  See  {Endemic}. 
 
  2.  Spreading  widely,  or  generally  prevailing;  affecting  great 
  numbers,  as  an  epidemic  does  as  epidemic  rage;  an 
  epidemic  evil. 
 
  It  was  the  epidemical  sin  of  the  nation.  --Bp. 
  Burnet. 

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