Select the option that can be used as a one-word substitute for the given group of words.

A state of perfect balance

Equilibrium

The one-word substitute for "a state of perfect balance" is equilibrium.

• Extempore means spoken without preparation.
• Medieval means relating to the Middle Ages, which was a period of European history from the 5th to the 15th centuries.
• Irrelevant means not connected with or relevant to something.

Equilibrium is a state in which opposing forces or influences are balanced. It can be used to describe a physical state, such as the equilibrium of a chemical reaction, or a mental state, such as the equilibrium of a person's emotions.