Definition of "grav"

My heart was pounding as it pumped blood to my brain — no small job, considering my height and the gravs.

1968, Fritz Leiber, A specter is haunting Texas

Proceed at a speed of four light years after accelerating thirteen gravs per millisecond.”

2009, Jack Davis, Will Elder, Al Jaffee, Humbug, page 32

. “They're small, can maneuver faster than we can,”Clare said. “Accelerating at three gravs, too.”

2014, Gregory Benford, Larry Niven, Shipstar: A Science Fiction Novel

Since there is no such thing as top or bottom in space, the ship's artificial gravs hold you to the floor no matter which end of the vessel points which way.

1950, Nelson Bond, Lancelot Biggs: Spaceman, page 76

... We will be going to low-gravity just before jump. Passengers should be firmly strapped in at this time." "Good," murmured Muerotte. "Cutting gravs...brace yourself.

2007, L. E. Modesitt, Jr., The Ecolitan Enigma

Trystin shut down the ventilation system and shifted the last of the power for gravs into the thrusters.

2010, L. E. Modesitt, Jr., The Parafaith War

A starship thundered invisibly close overhead, its gravs at full lift-off power.

1992, Bill Baldwin, The Defenders

The orbot was a speck, a clot, a ball, a toy. It was gliding silently in on gravs, directly overhead.

1992, Gardner Dozois, Geodesic Dreams: The Best Short Fiction Of Gardner Dozois, page 83

Air cars include any vehicle which are grav powered and are capable of flying, but unlike aeroplanes they handle similar to normal ground cars.

2008, Martin Rait, FSpace Roleplaying Conspiracy Convention Skills Guide v1.1, page 7

I set things up for the grav sled support and the Averonian operation.

2011, R Richard, Second Chance King of Avuls, page 7

With the gravs, I can land in ten seconds and be cutting a door for you at the same time.

2011, J. E. Murphy, Sanctuary, page 317