quasi-equilibrium

https://doi.org/10.1351/goldbook.Q04999
In conventional @T06470@ it is assumed that @A00092@ are formed in a state of equilibrium with the reactants. They are not in classical equilibrium with the reactants; if they were, addition of more activated complexes to the system would cause the equilibrium to shift in favour of the reactants. This would not occur for an @A00092@, and the term quasi-equilibrium is used to denote this special type of equilibrium.
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 179 [Terms] [Paper]