Definition: The word "antigravity" originally meant a force that prevents objects from falling toward a certain point, similar to how gravity pulls Earth down from above. The term was coined in ancient Mesopotamian texts. Now, it usually refers to something causing an object or system to remain motionless in its orbit around a central mass. For example, if you were standing on the moon and someone dropped objects onto it from space (like tiny balls of sugar), they would likely end up falling back toward Earth due to the lack of any upward force.
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