fee simple subject to executory interest English

Meaning fee simple subject to executory interest meaning

What does fee simple subject to executory interest mean?

fee simple subject to executory interest noun

— (legal) A defeasible fee created with clear durational language expressing a condition (e.g. "so long as", "until", "while") which causes ownership of a property to revest in a third party identified by the grantor if that condition comes about.