Entirety Clause Law and Legal Definition
In Oil & gas law, the entirety clause is a mineral-lease or deed provision which specifies that royalties must be apportioned if the property is subdivided after the lease is granted. For the lessee, the clause makes it clear that the lessee's duties will increase if the lessor transfers a part of the leased premises. If the lands covered by the lease are owned in separate tracts in the future, the lease will continue to be administered by the lessee as one lease. The clause avoids the non-apportionment rule for the lessor.