Anti-gravity

Anti-gravity was the process of creating objects free from or releasing objects from the force of gravity. The Time Lords' Matrix held many advanced scientific techniques, including the secret of anti-gravity power. (DW: The Mysterious Planet)

The Monk, a renegade Time Lord, used anti-gravity lifts to complete Stonehenge on Earth circa 1500 BC. (DW: The Time Meddler)

The Tractators could use their control of gravity to release objects from gravity. (DW: Frontios)

An Arcadian representative possessed an anti-gravity umbrella. (DWAM: Smart Bombs)

Air corridors projected by TARDISes had the option to use anti-gravity, allowing the occupant of the corridor to float through the corridor instead of walk. (DW: The Time of Angels)

TARDIS corridors normally used anti-gravity, as the corridors went vertically as well as horizontally. House disabled the anti-gravity in the corridors in an attempt to kill Amy Pond and Rory Williams. (DW: The Doctor's Wife)