Etymology
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countermand (v.)

"to revoke (a command or order)," early 15c., contremaunden, from Anglo-French and Old French contremander "reverse an order or command" (13c.), from contre- "against" (see contra (prep., adv.)) + mander, from Latin mandare "to order" (see mandate (n.)). Related: Countermanded; countermanding. As a noun, "a contrary order," 1540s.

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Definitions of countermand
1
countermand (v.)
cancel officially;
2
countermand (n.)
a contrary command cancelling or reversing a previous command;
From wordnet.princeton.edu