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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Heterogamy  \Het`er*og"a*my\,  n.  [See  {Heterogamous}.] 
  1.  (Bot.)  The  process  of  fertilization  in  plants  by  an 
  indirect  or  circuitous  method;  --  opposed  to  orthogamy. 
  2.  (Biol.)  That  form  of  alternate  generation  in  which  two 
  kinds  of  sexual  generation,  or  a  sexual  and  a 
  parthenogenetic  generation,  alternate;  --  in  distinction 
  from  {metagenesis},  where  sexual  and  asexual  generations 
  alternate.  --Claus  &  Sedgwick.