#1 equilibrium n. a stable situation in which forces cancel one another. wn
#2 equilibrium n. [chemical equilibrium] a chemical reaction and its reverse proceed at equal rates. wn
#3 equilibrium n. [balance, equipoise, counterbalance] equality of distribution. wn
#4 equilibrium n. [labyrinthine sense, vestibular sense, sense of balance, sense of equilibrium] a sensory system located in structures of the inner ear that registers the orientation of the head. wn
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