reversion

noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about reversion at Wordnik → Where our words come from →

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. (genetics) a return to a normal phenotype (usually resulting from a second mutation).
3. A reappearance of an earlier characteristic.