Coun·ter·mand v. t. [imp. & p. p. Countermanded; p. pr. & vb. n. Countermanding.]
  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.
  2. To prohibit; to forbid. [Obs.]
     Avicen countermands letting blood in choleric bodies.   --Harvey.
  3. To oppose; to revoke the command of.
     For us to alter anything, is to lift ourselves against God; and, as it were, to countermand him.   --Hooker.