mday

M-day

[em-dey]
noun Military.
mobilization day: a day assumed by the Department of Defense as the first day of mobilization, used by the military for planning purposes.

Origin:
1935–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Abbreviations & Acronyms
M-day
mobilization day
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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