Definition - What does Parent Partition mean?
A parent partition is an instance of partition within the Windows Hyper V virtualization environment that is responsible for running the virtualization stack and creating child partitions. The parent partition is the second layer of partition after the root partition. It directly interfaces with hardware and logical virtualization resources.
Techopedia explains Parent Partition
A parent partition is generally considered the root partition; however, parent partitions are logically distributed partitions for hypervisor-specific operations.