The Collaborative International Dictionary of English v.0.48:

Equilibration \E`qui*li*bra"tion\, n.
   1. Act of keeping a balance, or state of being balanced;
      equipoise.
      [1913 Webster]

            In . . . running, leaping, and dancing, nature's
            laws of equilibration are observed.   --J. Denham.
      [1913 Webster]

   2. (Biol.) The process by which animal and vegetable
      organisms preserve a physiological balance. --H. Spenser.
      [1913 Webster]

WordNet (r) 3.0 (2006):

equilibration
    n 1: stabilization by bringing into equilibrium