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

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• Wordscraper
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v. Present participle of countermand.

"Johnston was ruffled by what he termed a "countermanding" of his orders to the troops south of the James."

countermanded    countermanding    countermands   

command    dictation    bid    bidding   

prohibit    forbid    oppose    revoke   

annul    unlesse    abjure    rescission    disallowance