1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Eccentricity  \Ec`cen*tric"i*ty\,  n.;  pl  {Eccentricities}.  [Cf. 
  F.  excentricit['e].] 
  1.  The  state  of  being  eccentric;  deviation  from  the  customary 
  line  of  conduct;  oddity. 
 
  2.  (Math.)  The  ratio  of  the  distance  between  the  center  and 
  the  focus  of  an  ellipse  or  hyperbola  to  its 
  semi-transverse  axis. 
 
  3.  (Astron.)  The  ratio  of  the  distance  of  the  center  of  the 
  orbit  of  a  heavenly  body  from  the  center  of  the  body  round 
  which  it  revolves  to  the  semi-transverse  axis  of  the 
  orbit. 
 
  4.  (Mech.)  The  distance  of  the  center  of  figure  of  a  body,  as 
  of  an  eccentric,  from  an  axis  about  which  it  turns;  the 
  throw. 

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