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  2  definitions  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Bissextile  \Bis*sex"tile\,  n.  [L.  bissextilis  annus,  fr 
  bissextus  (bis  +  sextus  sixth  fr  sex  six)  the  sixth  of  the 
  calends  of  March,  or  twenty-fourth  day  of  February,  which  was 
  reckoned  twice  every  fourth  year,  by  the  intercalation  of  a 
  Leap  year;  every  fourth  year,  in  which  a  day  is  added  to  the 
  month  of  February  on  account  of  the  excess  of  the  tropical 
  year  (365  d.  5  h.  48  m.  46  s.)  above  365  days.  But  one  day 
  added  every  four  years  is  equivalent  to  six  hours  each  year, 
  which  is  11  m.  14  s.  more  than  the  excess  of  the  real  year. 
  Hence  it  is  necessary  to  suppress  the  bissextile  day  at  the 
  end  of  every  century  which  is  not  divisible  by  400,  while  it 
  is  retained  at  the  end  of  those  which  are  divisible  by  400. 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Bissextile  \Bis*sex"tile\,  a. 
  Pertaining  to  leap  year.