Definition of: equilibrium

(ē′kwə·lib′rē·əm) noun
1. A state of balance produced by the counteraction of two or more forces; equipoise.
2. Physics A condition of balance among forces acting within or upon a body or material system such that there is no change in the state of rest or motion of the system.
3. Chem. The state in a chemical process when the components no longer react among themselves or react in such a way as to maintain a balanced condition.
4. Equal balance of the mind between conflicting or differing motives or reasons; hence, fairness of judgment; well–balanced state. Also e′qui·lib′ri·ty. [<L aequilibrium <aequus equal + libra a balance]