Quadragesima
Concise Oxford English Dictionary © 2008 Oxford University Press:
Quadragesima /ˌkwɒdrəˈdʒɛsɪmə/
▶noun the first Sunday in Lent.
– origin from eccles. L., fem. of L. quadragesimus ‘fortieth’, from quadraginta ‘forty’ (Lent lasting forty days).
'Quadragesima' also found in these Oxford entries:

