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''Ultra vires'' is a Latin Phrase that literally means "beyond the power." Its inverse is called '''''intra vires''''', meaning "within the power".

It is used as a Legal term in a number of contexts:


  • Under Constitutional Law , particularly in Canada and the United States , constitutions give federal and provincial or state governments various powers. To go outside those powers would be ultra vires; for example, although the court did not use the term, in striking down a federal law in '' United States V. Lopez '' on the grounds that it exceeded the Constitutional authority of Congress, the Supreme Court effectively declared the law to be ''ultra vires''.



  • In Administrative Law , an act may be Judicially Reviewable ultra vires in a narrow or broad sense. Narrow ultra vires applies if an administrator did not have the substantive power to make a decision or it was wrought with procedural defects. Broad ultra vires applies if there is an abuse of power (e.g. Wednesbury Unreasonableness or bad faith) or a failure to exercise an administrative discretion (e.g. acting at the behest of another or unlawfully applying a government policy). Either doctrine may entitle a claimant to various prerogative writs, equitable remedies or statutory orders if they are satisfied.