reversion

Definition
(noun) (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) Definition
(noun) (genetics) a return to a normal phenotype (usually resulting from a second mutation) Definition
(noun) a reappearance of an earlier characteristic Definition
(noun) turning in the opposite direction Definition
(noun) returning to a former state Definition
(noun) a failure to maintain a higher state