WordReference Random House Unabridged Dictionary of American English © 2026
command′ing of′ficer, 
  1. [Army.]a commander of any rank from second lieutenant to colonel.
  • 1790–1800

Collins Concise English Dictionary © HarperCollins Publishers::
commanding officer n
  1. an officer in command of a military unit
'commanding officer' also found in these entries (note: many are not synonyms or translations):
cabin - CO - mister - order of the day - responsible - adjutant - commandant - commanding - general headquarters - old man - orderly - wardroom - staff
In Lists: Police, more...

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