Etymology
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commander (n.)

"one who has the authority or power to command or order," early 14c., comandur, from Old French comandeor "commander, commandant," from comander "to order, enjoin" (see command (v.)). Commander in chief "commander of all the armies of a state" is attested from 1650s. In the U.S., by the Constitution, it is the president; George Washington was so called by 1778.

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Definitions of commander

commander (n.)
an officer in command of a military unit;
Synonyms: commanding officer / commandant
commander (n.)
someone in an official position of authority who can command or control others;
commander (n.)
a commissioned naval officer who ranks above a lieutenant commander and below a captain;
commander (n.)
an officer in the airforce;
Synonyms: air force officer
From wordnet.princeton.edu