What is the term for a tenancy where the tenant occupies with the landlord's permission but without a definite rental period?

The term that refers to a tenancy where the tenant occupies a property with the landlord's permission but without a definite rental period is known as an Estate at Will. This type of tenancy allows the tenant to remain in the property indefinitely, as long as both the landlord and tenant agree to the arrangement. Unlike other forms of tenancy that have specified lengths, such as a lease for a designated period or a recurring rental cycle, an Estate at Will can be terminated at any time by either party, often with minimal notice.

In contrast, other types of estate, like a Periodic Estate, involve defined periods (e.g., monthly or yearly), whereas an Estate for Years has a fixed and defined duration. An Estate in Remainder pertains to future interests in property after a current interest expires and is not related to the definition of occupancy or rental agreements. The unique characteristic of an Estate at Will is its flexibility and lack of a predetermined end date, making it a suitable option for informal rental arrangements.