Etymology
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ultra vires

Latin, literally "beyond powers," from ultra "beyond" (see ultra-) + vires "strength, force, vigor, power," plural of vis (see vim). Usually "beyond the legal or constitutional power of a court, etc."

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Definitions of ultra vires
1
ultra vires (adv.)
beyond the scope or in excess of legal power or authority;
2
ULTRA VIRES (adj.)
beyond the legal power or authority of a person or official or body etc;
an ultra vires contract
From wordnet.princeton.edu