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reversion (n.)

late 14c., reversioun, a legal word used in reference to the return of an estate to the heirs of a grantor on the expiration of the grant, from Old French reversion and directly from Latin reversionem (nominative reversio) "act of turning back," noun of action from past-participle stem of revertere (see revert). From early 15c. as "a return to a place."

reversion has various senses, chiefly legal or biological .... It suffices to day that they all correspond to the verb revert, & not to the verb reverse, whose noun is reversal. [Fowler]

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Definitions of reversion from WordNet

reversion (n.)
(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);
reversion (n.)
(genetics) a return to a normal phenotype (usually resulting from a second mutation);
reversion (n.)
a reappearance of an earlier characteristic;
Synonyms: atavism / throwback
reversion (n.)
turning in the opposite direction;
Synonyms: reverse / reversal / turnabout / turnaround
reversion (n.)
returning to a former state;
reversion (n.)
a failure to maintain a higher state;
Synonyms: backsliding / lapse / lapsing / relapse / relapsing / reverting
From wordnet.princeton.edu