This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Law A party entitled to receive an estate in reversion.

n. A person who possesses the reversion to an estate or office.

n. One who has a reversion, or who is entitled to lands or tenements, after a particular estate granted is terminated.

n. One who has a reversion, or who is entitled to lands or tenements after a particular estate granted is determined: loosely applied in a general sense to any person entitled to any future estate in real or personal property.

n. (law) a party who is entitled to an estate in reversion

"Madame de Misery, Baronne de Biache, the Queen's first lady of the chamber, to whom I was made reversioner, was a daughter of M. le Comte de Chemant, and her grandmother was a Montmorency."

party