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Accessio is a concept from Roman property law for acquiring ownership of property (the accessory) which is merged, or acceded to, another piece of property (the principal).[1] Generally, the owner of the principal, whatever it may be, also became the owner of the accessory. Its usage continues in modern times in legal systems around the world incorporating Roman property law, primarily civilian legal systems.
Accessio was not a specific rule of original acquisition of property in itself; instead, it served as the principle underlying the modes of acquisition that had their own particular guidelines for determination of ownership.[2]