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"Another reason why privacy could be just a passing fad, terrorism is going to get too good. [1997]"
- Larry Niven

Antigravity  
  A force opposed to gravity.  

See antigrav boots for the earliest use of that word, as far as I know.

But the antigravity apparatus will have to be capable of generating a greater repulsive force than is required for ordinary interplanetary conditions.
From The Vanguard of Neptune, by J.M. Walsh.
Published by Wonder Stories in 1932
Additional resources -

Note that the idea of a force that acts in opposition to gravity can be found in the description of "apergy" found in Percy Greg's 1880 novel Across the Zodiac:

" I needed a repulsion which would act like gravitation through an indefinite distance and in a void..."

The use of antigravity is also seen in the spindizzy from James Blish's 1957 novel Cities in Flight.

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Additional resources:
  More Ideas and Technology from The Vanguard of Neptune
  More Ideas and Technology by J.M. Walsh
  Tech news articles related to The Vanguard of Neptune
  Tech news articles related to works by J.M. Walsh

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