Jour J

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French

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Etymology

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From jour +‎ J. From J for jour (day).

Calque of English D-Day, from D + day, D itself standing for day. From U.S. military terminology.

Proper noun

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Jour J m

  1. D-Day (6 June 1944) (WWII)
  2. (figuratively) The date of any major event planned for the future.