A more thorough explanation:

Definition: Procuracy (prok-y-si) is a legal document that gives power to an attorney-in-fact or agent to act on behalf of someone else. It is also known as a letter of agency.

Example: John gives his friend Tom a procuracy to sell his car while he is out of town. Tom can now legally act as John's agent and sell the car on his behalf.

Explanation: In this example, John is the principal and Tom is the agent. The procuracy gives Tom the legal authority to act on John's behalf and sell the car. Without the procuracy, Tom would not have the legal power to sell the car for John.