Quadragesima Sunday

from The Collaborative International Dictionary of English v.0.48

Quadragesima \Quad`ra*ges"i*ma\, n. [L., fr. quadragesimus the
   fortieth, fr. quadraginta forty; akin to quattuor four. See
   {Four}.] (Eccl.)
   The forty days of fast preceding Easter; Lent.
   [1913 Webster]

   {Quadragesima Sunday}, the first Sunday in Lent, about forty
      days before Easter.
      [1913 Webster]