noun \ˈem-ˌdā\

Definition of M-DAY

:  a day on which a military mobilization is to begin

Origin of M-DAY

mobilization day
First Known Use: 1924


Next Word in the Dictionary: MDCPrevious Word in the Dictionary: MDAll Words Near: M-day
May 22, 2015
nepotism Hear it
favoritism based on kinship
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears