Reversionary Interest Definition: Any interest, vested or contingent, the enjoyment of which is postponed. In the context of real property or wills and estates (probate), reversionery interest, see Legal Definition of Reversion. The term reversionary interest is used in others areas of the law. In Ferguson, Canada's Supreme Court wrote: "The appellants restrict reversionary interest to an interest which is of the nature of a reversion in the sense that it is something reserved to the grantor. But every postponed interest is like a reversion in the sense that it is a postponed interest." Canada's Copyright Act includes a reversionary interest provision at §14(1) pursuant to which the estate of an author of a copyright work retains copyright for 50 years after the death of the author. REFERENCES: Copyright Act, R.S.C. 1985, c. C-42 Duhaime, Lloyd, Legal Definition of CopyrightDuhaime, Lloyd, Legal Definition of Reversion Ferguson v MacLean [1930] S.C.R. 630, [1931] 1 D.L.R. 61 and 1930 CarswellNB 33 Categories & Topics: Intellectual Property and Internet Law Dictionary Real Estate and Tenancy Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!