Emily Dickinson Lexicon

E-QUI-LIB'RI-UM, n. [L.]

1. In mechanics, equipoise; equality of weight; the state of the two ends of a lever or balance when both are charged with equal weight, and they maintain an even or level position, parallel to the horizon. Encyc.
2. Equality of powers. Health consists in the equilibrium between those two powers. Arbuthnot.
3. Equal balancing of the mind between motives or reasons; a state of indifference or of doubt, when the mind is suspended in indecision, between different motives, or the different forces of evidence.