antigrav n.

The ship settled down gently, her antigrav plates moaning.

Well, cut off my antigravs and call me flighty—it really is here.

‘There’s a ship gravving up from your colony, Angstol,’ said Tulketh absently, as he gazed dreamily at his own screen. ‘Well, I suppose they'll have developed some sort of chemical rockets by now if they’re—did you say GRAVVING up?’… There below them, the familiar gleaming silver shape of a planetary ship was slowly ascending, with its longitudinal axis horizontal in the time-honoured manner of pre-blasting precautions. ‘They have got antigravs’ screeched Largoth, frantically. ‘We must not be seen!’

[T]here is a knock at my bedroom window at maybe three hours. I am not properly awake and do not think to question how somebody can be there, seeing it is five hundred feet up the tower; I open the window and B falls inside. I am just about ready to conclude I must be dreaming when B unstraps a small antigrav pack, mountaineering type, and says Somebody offered her the beastly thing as a secondhand bargain, she has been trying it out and it doesn’t work.

Quiet and undisconcerted, Spock went to the box, affixing anti-gravs to it.

How exactly did acrobats and tumblers using antigrav for extra bounce correspond to ‘the crowned heads of India and Indonesia (simulated)’?

Organize all hands and have them pick up the scattered pieces of the platform and those antigravs over there and the tools down the slope.

He felt the abrupt tug of the antigravs pulling on his equipment harness.

Other vessels, already crewed, lurched into the air on their antigravs.