rhizoverbBeta
DictionaryequilibriumBalance
noun

equilibrium

ee-kwi-LIB-ree-um/ˌiːkwɪˈlɪbriəm/

A stable state in which opposing forces or influences are balanced.

The scale reaches equilibrium when the weights on both sides match.

A freestanding equal-arm balance scale at rest, with a perfectly horizontal beam and identical metal weights in its two suspended pans, showing a stable balance of opposing torques.
Etymology
equiLatinequal, level
+libriumLatinbalance, pair of scales

The original image is a level pair of scales, with neither side outweighing the other. That even balance supplies the image for opposing forces or influences holding one another in balance.

In context

The Efficient Engineer6:34
To maintain equilibrium, these vertical shear stresses have complementary horizontal shear stresses
Understanding Stresses in Beams

More examples

  • A quiet walk helps her regain her emotional equilibrium.
  • Sweating helps the body maintain thermal equilibrium.
  • The market reaches equilibrium when supply matches demand.

Forms

equilibrium · equilibria · equilibriums

Similar words

balance
More general; can describe steadiness without opposing forces.
stability
Emphasizes resistance to change rather than balance between forces.