E`qui*lib"ri*um (?), n.; pl. E.
Equilibriums (#), L. Equilibria
(#). [L. aequilibrium, fr. aequilibris in equilibrium,
level; aequus equal + libra balance. See Equal,
and Librate.] 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.