Pronunciation: (ē"kwu-lib'rē-um, ek"wu-),[key] —n., —pl.-ri•ums, -ri•aPronunciation: (-rē-u).[key] 1. a state of rest or balance due to the equal action of opposing forces.
2. equal balance between any powers, influences, etc.; equality of effect.
3. mental or emotional balance; equanimity: The pressures of the situation caused her to lose her equilibrium. 4. Chem.the condition existing when a chemical reaction and its reverse reaction proceed at equal rates.