Accessio

I. In the civil law. Accession; a going or passing of one thing to or with another as its principal addition; an addition or increase; a mode of acquiring property as an accessory thing, as by increase of the principal through natural laws or natural causes, or by the interweaving, mixing or mingling by another of his materials with those of the person who thus acquires the property; a thing joined or, added to another; an incident or appurtenant; the profit, fruit or increase of a thing; an incidental or auxiliary obligation; the party contracting such an obligation, v. Accession; Res aceessoria, eta