Final answer:
An estate that will continue for a period of six months only, fixed in advance by contractual agreement of the parties is known as a term of years or leasehold estate.
Step-by-step explanation:
An estate that will continue for a period of six months only, fixed in advance by contractual agreement of the parties is known as a term of years or leasehold estate. This type of estate is created when there is an agreement between a landlord (lessor) and a tenant (lessee) for a fixed duration of six months. At the end of the six-month period, the estate terminates and the tenant must vacate the property.