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M-day

[em-dey] /ˈɛmˌdeɪ/
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.
Origin of M-day
1935-1940
First recorded in 1935-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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