antigravity

[an-tee-grav-i-tee, an-tahy-]

Physics. the antithesis of gravity; a hypothetical force by which a body of positive mass would repel a body of negative mass.

(not in technical use) a controllable force that can be made to act against the force of gravity.

(not in technical use) counteracting the force of gravity: The antigravity drive in this spaceship will enable us to reach Polaris.

Origin of antigravity

First recorded in 1940–45; anti- + gravity

Course you don't need much of a rocket when you have antigravity.
We Didn't Do Anything Wrong, Hardly
Roger Kuykendall
"Antigravity," I croaked, though you couldn't have heard me two feet.
The Night of the Long Knives
Fritz Reuter Leiber
Like the radar he made out of a TV set and the antigravity and the atomic power plant he invented to run it all with.
We Didn't Do Anything Wrong, Hardly
Roger Kuykendall
But just then the plane took a sickening bounce, as if its antigravity had only started to operate within yards of the ground.
The Night of the Long Knives
Fritz Reuter Leiber
It's supposed to have antigravity powers, too, like whatever it was that took Superior up in the first place.
And Then the Town Took Off
Richard Wilson