Definition of Mardi Gras
1a
: Shrove Tuesday often observed (as in New Orleans) with parades and festivities
b
: a carnival period climaxing on Shrove Tuesday
2
: a festive occasion resembling a pre-Lenten Mardi Gras
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Merriam-Webster unabridged
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Time Traveler for Mardi Gras
The first known use of Mardi Gras was in 1699
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