Mardi Gras - definition and synonyms

noun 

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/ˌmɑː(r)di ˈɡrɑː/
singularMardi Gras
pluralMardis Gras
  1. 2
    [countable/uncountable] in some countries, a celebration with parties and marches in the streets that often lasts for several days and ends on the night before Lent begins. The most famous celebration of Mardi Gras in the US takes place in New Orleans, Louisiana.
  2. 3
    [countable] Australian a celebration with parties and marches in the streets at any time of the year
Word story
From the French Mardi Gras, which means ’fat Tuesday’, a reference to the fact that people were expected to use up all their rich food before fasting during Lent.