Final answer:
Under the Registry Act, the term used to define evidence of ownership is 'title', which represents an owner's legal rights and evidence of ownership to property such as real estate, and is established through detailed declarations.
Step-by-step explanation:
Under the Registry Act, the term used to define evidence of ownership is title. When inhabitants, such as owners of houses, gardens, mills, fields, and vineyards, declare their property for taxation purposes, they provide a detailed declaration under oath.
The value established through this declaration then serves as the basis for calculating the taxes owed on the real estate. Additionally, the "Statement of past merit" sections in historical documents reference the service provided to a king or other patron, which might serve as a basis for the awarding of such titles or land in past times.
Today's concept of a title in legal terms represents the aggregate of rights, ownership, and evidence of these rights to property.