Anti-gravity is the idea of creating a place or object that is free from the force of gravity. It does not refer to the lack of weight under gravity experienced in free fall or orbit, or to balancing the force of gravity with some other force, such as electromagnetism or aerodynamic lift. Anti-gravity is a recurring concept in science fiction, particularly in the context of spacecraft propulsion. An early example is the gravity blocking substance "Cavorite" in H. G. Wells' The First Men in the Moon.

In Newton's law of universal gravitation, gravity was an external force transmitted by unknown means. In the 20th century, Newton's model was replaced by general relativity where gravity is not a force but the result of the geometry of spacetime. Under general relativity, anti-gravity is impossible except under contrived circumstances. Quantum physicists have postulated the existence of gravitons, a set of massless elementary particles that transmit the force, and the possibility of creating or destroying these is unclear.

"Anti-gravity" is often used colloquially to refer to devices that look as if they reverse gravity even though they operate through other means, such as lifters, which fly in the air by using electromagnetic fields.

Read more about Antigravity:  Empirical Claims and Commercial Efforts, Conventional Effects That Mimic Anti-gravity Effects

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Gravitational Interaction Of Antimatter - Motivations For Antigravity - Villata's Theory of Antigravity
... Several authors have pursued the idea of antigravity, either assuming that antimatter has negative gravitational mass, and thus is self-attractive, or that it is even self-repulsive ... get repulsion between matter and antimatter but he showed that antigravity appears as a prediction of general relativity, once it is assumed that this ... thus invalidating the Morrison argument against antigravity.) This may provide a test for the theory of antigravity the presence of antimatter in cosmic voids ...
Anti-gravity - Empirical Claims and Commercial Efforts - Recent Efforts
... Foundation has tried to reproduce different experiments which allegedly show an antigravity effect ... All attempts to observe an antigravity effect have been unsuccessful ... of one million euros for a reproducible antigravity experiment ...
Gravitational Interaction Of Antimatter - Motivations For Antigravity
... Supporters argue that antimatter antigravity would solve several important problems in physics ... On the other hand, supporters of antigravity argue that if mutually repulsive, equal amounts of matter and antimatter would precisely offset any attraction ... by dark matter models) based on antimatter antigravity ...