Etymology
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commandant (n.)

"commanding officer," especially of a fortified town or garrison, 1680s, from French commandant "the one commanding" originally "commanding," present participle of commander (Old French comander) "to order, enjoin;" see command (v.). Similar formation in Spanish and Italian comandante.

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Definitions of commandant

commandant (n.)
an officer in command of a military unit;
Synonyms: commanding officer / commander
From wordnet.princeton.edu