The term can be applied to a reaction in which there is an @E02011@ with the formation of an ionic intermediate.
Source: PAC, 1981, 53, 753. (Symbolism and Terminology in Chemical Kinetics) on page 767 [Terms] [Paper]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.