Noun
1. (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)
2. 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