Noun
bona vacantia (uncountable)
(UK, law) The principle that there is no unowned property, and that if there is no other owner then property vests in the Crown.
"The company asked also for an express vesting order concerning the land, which had legally gone to the Crown as bona vacantia" [1]
In both cases due to the particular function of bona vacantia in these areas, these titles afford rights encompassing the whole territorial designation of the holder, donated by the holder now to registered charities. Source: Internet
The Duchy administers bona vacantia within the County Palatine, receiving the property of persons who die intestate and where the legal ownership cannot be ascertained. Source: Internet