v. t. [ imp. & p. p. Countermanded; p. pr. & vb. n. Countermanding. ] [ F. contremander; contre (L. contra) + mander to command, fr. L. mandare. Cf. Mandate. ] 1. To revoke (a former command); to cancel or rescind by giving an order contrary to one previously given; as, to countermand an order for goods. [ 1913 Webster ]

2. To prohibit; to forbid. [ Obs. ] [ 1913 Webster ]

Avicen countermands letting blood in choleric bodies. Harvey. [ 1913 Webster ]

3. To oppose; to revoke the command of. [ 1913 Webster ]

For us to alter anything, is to lift ourselves against God; and, as it were, to countermand him. Hooker. [ 1913 Webster ]

n. A contrary order; revocation of a former order or command. [ 1913 Webster ]

Have you no countermand for Claudio yet,
But he must die to-morrow? Shak. [ 1913 Webster ]

a. Capable of being countermanded; revocable. Bacon. [ 1913 Webster ]