A written instrument authorizing a person to act as the agent of the person granting it, and a general power authorizing the agent to act generally in behalf of the principle. A special power limits the agent to a particular or specific act as: a landowner may grant an agent special power of attorney to convey a single and specific parcel of property. Under the provisions of a general power of attorney, the agent having the power may convey any or all property of the principal granting the general power of attorney.