
1) Christian Sunday observance 2) Second sunday before lent
Found on
https://www.crosswordclues.com/clue/sexagesima

Sexagesima ə, or, in full, Sexagesima Sunday, is the name for the second Sunday before Ash Wednesday in the Gregorian Rite liturgical calendar of the Roman Catholic Church, and also in that of some Protestant denominations, particularly those with Anglican and Lutheran origins. The name `Sexagesima` is derived from the Latin sexagesimus, meanin.....
Found on
http://en.wikipedia.org/wiki/Sexagesima

• (n.) The second Sunday before Lent; -- so called as being about the sixtieth day before Easter.
Found on
http://thinkexist.com/dictionary/meaning/sexagesima/
Sex`a·ges'i·ma noun [ Latin , fem. of
sexagesimus sixtieth, from
sexaginta sixty.]
(Eccl.) The second Sunday before Lent; -- so called as being about the sixtieth day before Easter.
Found on
http://www.encyclo.co.uk/webster/S/78
No exact match found.