Definition of ultra vires in English:

ultra vires

adverb & adjective

Law
  • Beyond one's legal power or authority.

    as adjective ‘jurisdictional errors render the decision ultra vires’
    • ‘Delegated legislation is also subject to control by the courts whose judges can declare a piece of delegated legislation to be ultra vires.’
    • ‘It is not suggested that Byelaw 20 was itself ultra vires the powers which the primary legislation conferred upon the British Railways Board.’
    • ‘As a result, a taxpayer who has made a payment pursuant to ultra vires legislation has a right to restitution.’
    • ‘An ultra vires act is one beyond the purposes or powers of a corporation.’
    • ‘This lesson provides an overview of the historical significance of the ultra vires doctrine, its subsequent decline in importance, and its modern status.’

Origin

Latin, literally ‘beyond the powers’.

Pronunciation

ultra vires

/ˌəltrə ˈvaɪriz//ˌəltrə ˈvīrēz/