equilibrium

1. (chemistry) The state of a reaction in which the rates of the forward and reverse reactions are the same.

2. (physics) The state of a body at rest or in uniform motion in which the resultant of all forces on it is zero.Examples: "It now appears that the locomotive did not blow up, as was commonly stated at the time, but that the aeroplane flew so low as to come into contact with the dome of the engine, knocking it off. It was the combination of the impact and the uprush of steam that so disturbed the equilibrium of the raider as to cause it to crash."Antonyms: disequilibrium, non-equilibrium