See first quotes from Christopher Anvil
contragravity n. | 1965 | Plateau in Amazing Stories Mar. 71/2 You have endless power, can control atomic and molecular structure, process metals, set up impenetrable barriers, create contragravity, [etc.].
gravitically adv. | 1958 | Foghead in Astounding Science Fiction Sept. 43/2 THIS AMOUNTS TO ITS BEING CORRECTLY POSITIONED GRAVITICALLY…IF NOT LEVEL IT CANNOT FUNCTION.