A power

a written authority from one person empowering another to transact business for him.

See also: Attorney

References in classic literature ?
Biographical historians and historians of separate nations understand this force as a power inherent in heroes and rulers.
They do not recognize it as a power inherent in heroes and rulers, but as the resultant of a multiplicity of variously directed forces.
Speaking so, the historians of culture involuntarily contradict themselves, and show that the new force they have devised does not account for what happens in history, and that history can only be explained by introducing a power which they apparently do not recognize.
With another, the admission of the President into any share of a power which ever must be a dangerous engine in the hands of the executive magistrate, is an unpardonable violation of the maxims of republican jealousy.
It announced itself as the work of the people themselves; and as this was unquestionably a power assumed by the Convention, not delegated to them by the people, they religiously confined it to a simple power to propose, and carefully provided that it should be no more than a proposal until sanctioned by the Confederation Congress, by the State Legislatures, and by the people of the several States, in conventions specially assembled, by authority of their Legislatures, for the single purpose of examining and passing upon it.
When the jealous and niggardly policy of their British sovereign denied them even that humblest of requests, and instead of liberty would barely consent to promise connivance, neither he nor they might be aware that they were laying the foundations of a power, and that he was sowing the seeds of a spirit, which, in less than two hundred years, would stagger the throne of his descendants, and shake his united kingdoms to the centre.
Communism is already acknowledged by all European Powers to be itself a Power.
The word "appoint" is synonymous with designate, so a surviving spouse with a power of appointment over trust property can transfer ownership of the stock (that is, designate a new owner) to anyone, including a subsequent spouse or children from a prior marriage.
As the name suggests, under the terms of a power of appointment trust, a surviving spouse must have the power to appoint trust property, giving the surviving spouse the ability to control the disposition of trust property, including S corporation stock.
Supplier A offered to visit West Lafayette to perform a power consumption comparison with the current presses.
I don't think it affects McGwire - he's been a power hitter since he played for the Oakland A's,'' said Mike Duran, 13, a pitcher and shortstop for the Sun Valley All-Stars.