Quinquagesima
Quinquagesima is the Sunday before Ash Wednesday, also called Quinquagesima Sunday, Shrove Sunday or Esto Mihi. The name originates from Latin quinquagesimus (fiftieth), referring to the fifty days before Good Friday.
(This calculation includes Sundays, unlike the quadragesimus calculation for Ash Wednesday itself.)
A quinquagesima can also be any fifty day period in the Catholic year, such as the time from Easter to Pentecost.
