This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

v. Simple past tense and past participle of countermand.

"Minister’s counsel and again countermanded his order to slay his son."

countermanded    countermanding    countermands   

command    dictation    bid    bidding   

prohibit    forbid    oppose    revoke   

annul    unlesse    abjure    rescission    disallowance