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M-day

[ em-dey ]

noun

, Military.
  1. mobilization day: a day assumed by the Department of Defense as the first day of mobilization, used by the military for planning purposes.


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Word History and Origins

Origin of M-day1

First recorded in 1935–40

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Example Sentences

John M. Day, Morris Township, was a good-hearted man, but seemed physically unable to withstand the hardships of active service.

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