The condition of a system in which competing influences are balanced, resulting in no net change. / Mental balance.

plural of equilibrium

(physics) the state of a system in which its energy distribution is such that all parts of the system have the same temperature and no heat flows

(physics) Any system in which the sum of the forces, and torque, on each particle of the system is zero; mechanical equilibrium. / (economics) A market in which demand and supply are the same.

Any equilibrium in which opposite changes occur simultaneously. / (chemistry) An equilibrium in which two reversible reactions occur at the same rate.

(economics) The price of a commodity at which the quantity that buyers wish to buy equals the quantity that sellers wish to sell.

A theory of evolution, holding that evolutionary change tends to be characterized by long periods of stability, or equilibrium, punctuated by episodes of very fast development.

(game theory) The set of choices of players' strategies for which no player can benefit by changing his or her strategy assuming that the other players keep theirs unchanged.

(physics) The state in which a solid or liquid body has relaxed into the shape that it would have if it were a calm (equilibrium) liquid. Mathematically, this means a sphere if it is not distorted by another body and is not rotating, but an oblate or scalene ellipsoid if rotating moderately, and piriform if rotating beyond the ellipsoidal limit. When in contact with another object, such as oil drops on or in water, other shapes occur.

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