The reverse of cycloaddition. The term is preferred to the synonyms 'cycloreversion', 'retro-addition' and 'retrocycloaddition'.
Source:
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1104 (https://doi.org/10.1351/pac199466051077)