Etymology
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Mardi Gras (n.)

 "Shrove Tuesday, last day of carnival, day of eating and merrymaking before the fasting season of Lent," 1690s, French, literally "fat Tuesday," from mardi "Tuesday" (12c. in Old French, from Latin Martis diem "day of the planet Mars;" see Tuesday) + gras "fat," from Latin crassus, "thick," which is of unknown origin.

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Good Friday (n.)
the Friday before Easter, c. 1300, from good (adj.) in Middle English sense of "holy, sacred," especially of holy days or seasons observed by the church; the word also was applied to Christmas and Shrove Tuesday. Good Twelfthe Dai (c. 1500) was Epiphany (the twelfth day after Christmas).
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