Definition 4: a stable situation in which forces cancel one another - [noun denoting state]
(equilibrium is a kind of ...) the general state of things; the combination of circumstances at a given time
"the present international situation is dangerous""wondered how such a state of affairs had come about""eternal truths will be neither true nor eternal unless they have fresh meaning for every new social situation"
(... is a kind of equilibrium ) (aeronautics) the state of equilibrium in which centrifugal forces due to a rotating mass (e.g., a propeller) do not produce force in the shaft and so vibration is reduced
(... is a kind of equilibrium ) (physiology) metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting changes
(... is a kind of equilibrium ) (game theory) a stable state of a system that involves several interacting participants in which no participant can gain by a change of strategy as long as all the other participants remain unchanged