home Ada Augustyniak equilibrium e⋅qui⋅lib⋅ri⋅um [ee-kwuh-lib-ree-uhm] –noun 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. Chemistry. the condition existing when a chemical reaction and its reverse reaction proceed at equal rates. e a b c d e f g h i j k l m n o p q r s t u v w x y z epiphany ephemeral eventuality error exhausted equilibrium extension