reversion

noun

1. 1

   a failure to maintain a higher state

2. 2

   returning to a former state

3. 3

   turning in the opposite direction

4. 4

   a reappearance of an earlier characteristic

5. 5

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

6. 6

   (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)