Webster's English Dictionary

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reversion

re.ver.sion \ri-'v*r-zh*n, -sh*n\ n [ME, fr. MF, fr. L reversion-, reversio 
   act of returning, fr. re]versus, pp. 1a: the part of a simple estate 
   remaining in its owner after he has granted  therefrom a lesser particular 
   estate 1b: a future interest in property left in a grantor or his successor 
    2: the right of succession or future possession or enjoyment  3: an act or 
   the process of returning (as to a former condition); esp  : a return toward 
   some ancestral type or condition 4: an act or instance of turning the 
   opposite way : the state of being so  turned 5: a product of reversion; 
   specif : an organism with an atavistic c haracter