GNU Collaborative International Dictionary of English

Found one definition 

  1.       

    Equilibrium , 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.
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    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.
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      Health consists in the equilibrium between those two powers.
      Arbuthnot.

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    3. A balancing of the mind between motives or reasons, with consequent indecision and doubt.
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      Equilibrium valve (Steam Engine), a balanced valve. See under Valve.
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