- the tendency of a system, especially the physiological system of higher animals, to maintain internal stability, owing to the coordinated response of its parts to any situation or stimulus that would tend to disturb its normal condition or function.
- a state of psychological equilibrium obtained when tension or a drive has been reduced or eliminated.
- the ability of members of a colony of social insects to behave cooperatively to produce a desired result, as when bees coordinate the fanning of their wings to cool the hive.
- the maintenance of metabolic equilibrium within an animal by a tendency to compensate for disrupting changes
- the maintenance of equilibrium within a social group, person, etc
