Final answer:
A fee on condition, or fee simple subject to a condition subsequent, is a type of ownership in real estate where ownership is subject to a condition. If the condition is not met, the owner may be required to forfeit the property to the original grantor or their heirs.
Step-by-step explanation:
A fee simple subject to a condition subsequent, also known as a fee on condition, refers to a type of ownership in real estate where ownership is subject to a condition. If the condition is not met, the owner may be required to forfeit the property to the original grantor or their heirs. This type of estate is characterized by the presence of a condition subsequent, which is a future event or action that, if it occurs, allows the original grantor to regain ownership.