1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Sexennial  \Sex*en"ni*al\,  a.  [L.  sexennium  a  period  of  six 
  years,  sexennis  of  six  years;  sex  six  +  annus  a  year.  See 
  {Six},  and  {Annual}.] 
  Lasting  six  years,  or  happening  once  in  six  years.  --  n.  A 
  sexennial  event. 

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