Final answer:
In a conventional life estate, the return of the property to the original owner after the death of the life tenant is called a reversion.
Step-by-step explanation:
In a conventional life estate, when the original owner takes the property back, it is called a reversion. A life estate is an interest in real property that is limited to the duration of a designated person's life, often the person holding the life estate. Upon the death of the life tenant, the property may revert to the original owner if the arrangement specifies such a condition. This scenario is referred to as a reversion because the interest in the property 'reverts' to the original owner or their heirs.