Source : Webster's Revised Unabridged Dictionary (1913)

Quinquagesima \Quin`qua*ges"i*ma\, a. [L., fr. quinquagesimus
   the fiftieth, akin to quinquaginta fifty, quinque five. See
   {Five}.]
   Fiftieth.

   {Quinquagesima Sunday}, the Sunday which is the fiftieth day
      before Easter, both days being included in the reckoning;
      -- called also {Shrove Sunday}.

Source : WordNet®

Quinquagesima
     n : the Sunday before Ash Wednesday (the beginning of Lent)
         [syn: {Quinquagesima Sunday}]