1. To clear a room, a house, or a place of occupants or to empty or to clear a place, receptacle, etc. of something: The overloaded gas tank of the car at the filling station was voiding when the customer tried to add too much gas.
2. Making or declaring something as invalid or that it is no longer in effect: The guarantee of the vacuum cleaner stated that any unauthorized repairs would void the warranty.
3. To take away a legal force of or to render something ineffective and to declare it as invalid: The trial about Bill's speeding was voided by the judge because it was only a mile over the limit in that section,

The U.S. Embassy issued a new passport and voided the old one for Andrew.

A contract can be valid, but it may be legally voided at the option of anyone who is involved.