Origin and history of commandant
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.
Entries linking to commandant
c. 1300, "order or direct with authority" (transitive), from Old French comander "to order, enjoin, entrust" (12c., Modern French commander), from Vulgar Latin *commandare, from Latin commendare "to recommend, entrust to" (see commend); altered by influence of Latin mandare "to commit, entrust" (see mandate (n.)). In this sense Old English had bebeodan.
Intransitive sense "act as or have authority of a commander, have or exercise supreme power" is from late 14c. Also from late 14c. as "have within the range of one's influence" (of resources, etc.), hence, via a military sense, "have a view of, overlook" in reference to elevated places (1690s). Related: Commanded; commanding.
Command-post "headquarters of a military unit" is from 1918. A command performance (1863) is one given by royal command.