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j'ouvert

noun
  1. mainly Caribbean the eve of Mardi gras; the Monday morning on which the festivities begin

Word Origin for j'ouvert

from French jour ouvert the day having been opened
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012