Quinquagesima Sunday

from WordNet (r) 3.0 (2006)

Quinquagesima Sunday
    n 1: the Sunday before Ash Wednesday (the beginning of Lent)
         [syn: {Quinquagesima}, {Quinquagesima Sunday}]

from The Collaborative International Dictionary of English v.0.48

Quinquagesima \Quin`qua*ges"i*ma\, a. [L., fr. quinquagesimus
   the fiftieth, akin to quinquaginta fifty, quinque five. See
   {Five}.]
   Fiftieth.
   [1913 Webster]

   {Quinquagesima Sunday}, the Sunday which is the fiftieth day
      before Easter, both days being included in the reckoning;
      -- called also {Shrove Sunday}.
      [1913 Webster]