(n.) Evenness of mind; calm temper or firmness of mind\ which is not easily elated or depressed; patience; calmness; composure; as, to bear misfortunes with equanimity.

accordance aplomb assurance ataraxy balance calm calmness composure confidence consistency consonance constancy continuity coolness correspondence detachment equability equilibrium equipoise evenness homogeneity imperturbability level head levelheadedness monolithism persistence phlegm placidity poise possession presence of mind restraint sangfroid self-assurance self-command self-confidence self-control self-possession self-restraint serenity stability steadfastness steadiness tranquillity uniformity unity unruffledness well-regulated mind