E·qui·lib·ri·um n.; pl. E. Equilibriums L. Equilibria
 1. Equality of weight or force; an equipoise or a state of rest produced by the mutual counteraction of two or more forces.
 2. A level position; a just poise or balance in respect to an object, so that it remains firm; equipoise; as, to preserve the equilibrium of the body.
    Health consists in the equilibrium between those two powers.   --Arbuthnot.
 3. A balancing of the mind between motives or reasons, with consequent indecision and doubt.
 Equilibrium valve Steam Engine, a balanced valve. See under Valve.

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