pro·rup·tion \-pshən\noun (-s) Etymology: Late Latin proruption-, proruptio action of bursting forth, from Latin proruptus (past participle of prorumpere) + -ion-, -io -ion : a bursting forth : the state of being protuberant or distended < proruption in form reduces the labor efficiency of the farm — C.L.White & G.T.Renner >