A gauge boson that mediates the (extremely weak) gravitational interactions between particles

Usage examples of gravitons.

That was the day that Jeffrey Horton began pursuing the stimulated emission of gravitons, the tiny bosons which were the vector of universal gravity.

Maybe later both would have the influence to tell offensive interlopers and political hacks to find some gravitons and go fly a kite.

The metal flows in a molecular stream butand this is what makes the process so importantit greedily absorbs gravitons from the nearest layer, thus setting off a chain of liquefying reactions.

But some of the gravitons are radiated in the form of gravitic energythat hissing sound you heard and therefore it takes about an hour before a newly liquefied piece of metal returns to its solid state.