Equilibrium (noun)

1. A state of balance or stability due to opposing forces being equal.
2. A state in which all acting influences are balanced.
3. A state in which a chemical reaction proceeds at the same rate in both the forward and reverse directions.
4. A state of rest or motion in which the forces acting on a body are balanced.
5. A state of economic balance, such as a balance between supply and demand.

Origin:

From late latin aequilibrium, from latin aequus ("equal") + libra ("balance"), from the verb librare ("to balance"), from the noun libra ("pound"). .

Examples:

1. The equilibrium of the ecosystem was disrupted by the introduction of the invasive species.
2. The company's equilibrium was threatened by the new competition.
3. The equilibrium of the chemical reaction was reached after several hours.
4. The rider's equilibrium was off, causing him to fall off the horse.
5. The market reached equilibrium with the price of goods being neither too high nor too low.