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ultra vires

[uhl-truh vahy-reez] /ˌʌl trə ˈvaɪ riz/
adverb, adjective, Law.
beyond the legal power or authority of a corporation, corporate officer, etc. (opposed to intra vires).
Origin of ultra vires
First recorded in 1785-95, ultra vires is from the Latin word ultrā vīrēs literally, beyond strength Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for ultra vires

ultra vires

adverb, adjective
(predicative) (law) beyond the legal power or authority of a person, corporation, agent, etc
Word Origin
Latin, literally: beyond strength
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ultra vires

Latin, literally "beyond powers," from vires "strength, force, vigor, power," plural of vis.

Online Etymology Dictionary, © 2010 Douglas Harper
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