countercommand verb 2noun 1forms 3 verb2 •To countermand (a previous command). •To countermand (a person or group). noun1 •A command that cancels or reverses a previous command; a countermand.Someone else had given a countercommand — the Spanish soldiers were in riotous retreat! Don Carlos was engulfed by the screaming swirl of the Moorish horsemen. — 1933 formscountercommanded · countercommanding · countercommands