A chemical reaction and its reverse proceed at equal rates WordNet 3.0 & Open English WordNet

In a chemical reaction, chemical equilibrium is the state in which both the reactants and products are present in concentrations which have no further tendency to change with time, so that there is no observable change in the properties of the system. Wikipedia

State in which both reactants and products are present in concentrations which have no further tendency to change with time.There are no net changes in the concentrations of the reactant and product. Such a state is known as dynamic equilibrium Wikidata

The state in which the chemical activities or concentrations of the reactants and products do not change over time. OmegaWiki

The state of a reversible reaction in which the rates of the forward and reverse reactions are the same. Wiktionary

State of a reversible reaction in which the rates of the forward and reverse reactions are the same. Wiktionary (translation)

The state of a reaction in which the rates of the forward and reverse reactions are the same. Wiktionary

Chemistry: state of a reaction in which the rates of the forward and reverse reactions are the same. Wiktionary (translation)