An extreme type of stripping reaction in which one reaction product has almost the same direction and momentum as one of the reactant molecules had before the reactive collision occurred.
Source:
PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 186 (https://doi.org/10.1351/pac199668010149)