1.
a. : the legal right of taking or resuming possession of real estate in a peaceable manner
b. : power of termination
c. : a legal right to enter upon land in the possession of another for a special purpose (as of an owner to show land to a prospective purchaser or of a landlord to make repairs) without being guilty of a trespass
2. : the right of an alien to enter a nation, state, or other political jurisdiction for some special purpose (as of a journalist to report or of a student to study)