from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A hypothetical particle postulated to be the quantum of gravitational interaction and presumed to have an indefinitely long lifetime, zero electric charge, and zero rest mass. See Table at subatomic particle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hypothetical gauge boson that regulates the gravitational force. It would have a spin of 2 and zero rest mass.
from the GNU version of the Collaborative International Dictionary of English
- n. A theoretical gauge boson that mediates the (extremely weak) gravitational interactions between particles; the quantum of the gravitational field, having zero rest mass and a spin of 2.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a gauge boson that mediates the (extremely weak) gravitational interactions between particles
gravit(ation) + -on1.(American Heritage® Dictionary of the English Language, Fourth Edition)