Quadragesima ('fortieth') is the Latin name for the whole season of Lent, with its forty days (so also its French derivative, carême); but the name is commonly assigned to the first Sunday in Lent, by analogy with the three Sundays which precede Lent—Septuagesima, Sexagesima, and Quinquagesima (q.v.).
Quadragesima
Chambers's Encyclopaedia, Volume 8: Peasant to Eoumelia, p. 514
Source scan(s): p. 0523