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From The Collaborative International Dictionary of English v.0.48:
Quinquagesima \Quin`qua*ges"i*ma\, a. [L., fr. quinquagesimus the fiftieth, akin to quinquaginta fifty, quinque five. See Five.] Fiftieth. [1913 Webster] Quinquagesima Sunday, the Sunday which is the fiftieth day before Easter, both days being included in the reckoning; -- called also Shrove Sunday. [1913 Webster]