e ‧ qui ‧ lib ‧ ri ‧ um /ˌiːkwəˈlɪbriəm, ˌiːkwɪˈlɪbriəm/ BrE AmE noun [singular, uncountable]
[ Date: 1600-1700 ; Language: Latin ; Origin: aequilibrium , from aequi- ( EQUI- ) + libra 'weight, balance' ]
1 . 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:
The government is anxious not to upset the economic equilibrium.
2 . a state in which you are calm and not angry or upset:
She struggled to recover her equilibrium.