What is the term for an act of liberality where someone disposes of a thing or right gratis in favor of another?

The term that describes an act of liberality where someone disposes of a thing or right without expecting anything in return in favor of another is known as a donation. This concept embodies the essence of generosity, where the donor voluntarily transfers ownership or rights to the recipient, typically considered a gift. In legal terms, a donation is characterized by its gratuitous nature, meaning that it is given without a required compensation or reciprocal exchange.

Other terms like succession or occupation pertain to different legal concepts. Succession, for example, deals with the transmission of rights and obligations from one person to another upon death, while occupation refers to the appropriation of property that is unowned. Tradition, on the other hand, involves the physical delivery of a thing to transfer ownership but does not inherently imply that the transfer is gratuitous. Thus, donation distinctly captures the idea of a generous and voluntary transfer of property or rights, making it the correct answer in this context.