(Latin: a delegate cannot further delegate)
The rule that a person to whom a power, trust, or authority is given to act on behalf, or for the benefit of, another, cannot delegate this obligation unless expressly authorized to do so. For instance, an auditor who has been appointed to audit the accounts of a company cannot delegate the task to another unless expressly allowed to do so. If express authorization has not been granted the auditor will have acted ultra vires.
Subjects: Business and Management — Law.