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ultra vires

[uhl-truh vahy-reez] /ˌʌl trə ˈvaɪ riz/
noun, Law.
1.
beyond the legal power or authority of a corporation, corporate officer, etc. (opposed to intra vires).
Origin
1785-1795
1785-95; < Latin ultrā vīrēs literally, beyond strength
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ultra vires

ultra vires

/ˈvaɪriːz/
adverb, adjective
1.
(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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