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officer of the day

noun, Military.
an officer who has charge of the guard and prisoners on an assigned day at a military installation.
Abbreviation: OD, O.D., O.O.D.
Origin of officer of the day
First recorded in 1835-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for officer of the day

officer of the day

a military officer whose duty is to take charge of the security of the unit or camp for a day Also called orderly officer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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