Noun
The third Sunday before Lent; -- so called because it is about seventy days before Easter.
Source: Webster's dictionaryThe earlier form of the Roman Rite, with its references to Quinquagesima Sunday, and to the Sexagesima and Septuagesima Sundays, continues to be observed in some communities. Source: Internet
Furthermore, anyone found to have eaten meat after Septuagesima is severely punished, by having his teeth knocked out. Source: Internet