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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Effervescence  \Ef`fer*ves"cence\,  Effervescency 
  \Ef`fer*ves"cen*cy\,  n.  [Cf.  F.  effervescence.] 
  A  kind  of  natural  ebullition;  that  commotion  of  a  fluid  which 
  takes  place  when  some  part  of  the  mass  flies  off  in  a  gaseous 
  form  producing  innumerable  small  bubbles;  as  the 
  effervescence  of  a  carbonate  with  citric  acid.