a state of rest or balance due to the equal action of opposing forces.

equal balance between any powers, influences, etc.; equality of effect.

mental or emotional balance; equanimity

The pressures of the situation caused her to lose her equilibrium.

Chemistry . the condition existing when a chemical reaction and its reverse reaction proceed at equal rates.

noun

imbalance , unevenness

noun

calm , calmness , composure , cool , coolness , counterbalance , counterpoise , equanimity , equipoise , poise , polish , rest , serenity , stability , stasis , steadiness , steadying , symmetry , balance