A power

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

See also: Attorney

References in classic literature ?
Of the same nature are these other maxims in ethics and politics, that there cannot be an effect without a cause; that the means ought to be proportioned to the end; that every power ought to be commensurate with its object; that there ought to be no limitation of a power destined to effect a purpose which is itself incapable of limitation.
Here then is a power to change the title; to insert new articles; to alter old ones.
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.