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  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Attenuation  \At*ten`u*a"tion\,  n.  [L.  attenuatio:  cf  F. 
  att['e]nuation.] 
  1.  The  act  or  process  of  making  slender,  or  the  state  of 
  being  slender;  emaciation. 
 
  2.  The  act  of  attenuating;  the  act  of  making  thin  or  less 
  dense,  or  of  rarefying,  as  fluids  or  gases. 
 
  3.  The  process  of  weakening  in  intensity;  diminution  of 
  virulence;  as  the  attenuation  of  virus. 
 
  From  WordNet  r  1.6  [wn]: 
 
  attenuation 
  n  1:  weakening  in  force  or  intensity:  "attenuation  in  the  volume 
  of  the  sound"  [syn:  {fading}] 
  2:  the  property  of  something  that  has  been  weakened  or  reduced 
  in  thickness  or  density 

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