the military officer in overall command of all forces in one theatre of operations
supreme commander in American English
noun
the military officer commanding all allied forces in a theater of war
Word origin
[1940–45]This word is first recorded in the period 1940–45. Other words that entered Englishat around the same time include: airlift, blockbuster, debrief, redline, zap
Examples of 'supreme commander' in a sentence
supreme commander
But the supreme commander was missing.
Times, Sunday Times (2010)
The president is not only the supreme commander of the armed forces, but also has the power to remove and appoint the armed forces chief.