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M-day

American  
[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.


Etymology

Origin of M-day

First recorded in 1935–40

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The Detroit News concluded that M-day had probably encouraged the enemy but added that it had also "served as a national safety valve for the venting of frustrations, legitimate and otherwise."

From Time Magazine Archive

As he addressed an Indiana University audience on the eve of M-day, counseling nonviolence, someone turned off the lights in the lecture hall.

From Time Magazine Archive

When M-day came to WPB last week, Donald Nelson faced a dilemma of his own making.

From Time Magazine Archive

There's ample time for a backlash against the backlash as M-day draws closer and people start feeling millennial peer pressure to make impressive plans.

From Time Magazine Archive

Yet M-day 1969 was a peaceful protest without precedent in American history because of who the participants were and how they went about it.

From Time Magazine Archive

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