equilibrium به انگلیسی

From Longman Dictionary

e‧qui‧lib‧ri‧um /ˌiːkwəˈlɪbriəm/ ●○○ noun [singular, uncountable]
a balance between different people, groups, or forces that compete with each other, so that none is stronger than the others and a situation is not likely to change suddenly
a state in which you are calm and not angry or upset

Example
The operation of the free market maintains an equilibrium between supply, demand and price
The shock of Freddie’s death had upset her equilibrium
The temperature at which the solid and liquid are in equilibrium is called the freezing point
And, indeed, his theory is firmly rooted in his conception of equilibrium
This account has so far been in partial equilibrium terms