termination

https://doi.org/10.1351/goldbook.T06274
The steps in a chain reaction in which reactive intermediates are destroyed or rendered inactive, thus ending the chain.
Source:
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1173 (https://doi.org/10.1351/pac199466051077)