重じゅう力りょく子しじゅうりょくしMeanings1noungravitonphysicsHypothetical elementary particle that mediates gravity in quantum field theory. Used in physics contexts.See also: グラビトン重じゅう力りょく子しはまだ実じっ験けん的てきに確かく認にんされていない。The graviton has not yet been experimentally confirmed.