Definitions:

1. A Latin phrase used in law to describe an act which requires legal authority but is done without it. ADJECTIVE
   • The court invalidated the zoning ordinance, ruling that it was ultra vires because it exceeded the city's planning powers.
2. Latin phrase meaning "beyond the powers". ADJECTIVE
   • A city ordinance banning all protests was rules ultra vires by the court.
3. Used to describe actions taken by a person or body, especially a corcoration or government entity, that are outside the scope of their legal authority. ADJECTIVE
   • Shareholders sued the company for an ultra vires action not authorized by its bylaws.

Synonyms:

• illegal
• unconstitutional
• unlawful