A grant to an inventor of the right to exclude others for a limited time from make, using, or selling his invention in the United States.

Source: U.S. Courts

A property right granted by the Government of the United States of America to an inventor ito exclude others from making, using, offering for sale, or selling the invention throughout the United States or importing the invention into the United Statesi for a limited time in exchange for public disclosure of the invention when the patent is granted.

Source: U.S. Patent and Trademark Office.