SynonymDefinitionAntonym.com - English Synonym Dictionary

A failure to maintain a higher state

Turning in the opposite direction

Returning to a former state

(genetics) a return to a normal phenotype (usually resulting from a second mutation)

A reappearance of an earlier characteristic

(law) an interest in an estate that reverts to the grantor (or his heirs) at the end of some period (e.g., the death of the grantee)