reversion

noun

1. (law) an interest in an estate that reverts to the grantor (or their heirs) at the end of some period (e.g., the death of the grantee)
2. (genetics) a return to a normal phenotype (usually resulting from a second mutation)
3. a reappearance of an earlier characteristic
4. turning in the opposite direction
5. returning to a former state
6. a failure to maintain a higher state