Definition of "reversionary"

If this was unrestricted freehold, the land is available for sale or lease, although often it is not readily marketable, by reason of its shape and access; neighbouring landowners are possible purchasers. In some cases, reversionary rights were reserved to neighbouring landowners when the land was acquired.

1951 June, “The Why and the Wherefore: Abandoned Branch Lands”, in Railway Magazine, page 428

Small animalsBegan to mooch around and climb up thisReversionary desk and dustable heirloom.

1958, Howard Nemerov, “Seven Macabre Songs”, in Mirrors and Windows