What is the meaning of reversion?

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. ()
• Genetics) a return to a normal phenotype (usually resulting from a second mutation. ()
• A reappearance of an earlier characteristic.
  • synonyms: atavism, throwback
• Turning in the opposite direction.
  • synonyms: reverse, reversal, turnabout, turnaround
• Returning to a former state.
  • synonyms: regression, regress, retrogression, retroversion
• A failure to maintain a higher state.
  • synonyms: backsliding, lapse, lapsing, relapse, relapsing, reverting