Enclave

Definition
An enclave is

"[A]n environment that is under the control of a single authority and has a homogeneous security policy, including personnel and physical security. Local and remote elements that access resources within an enclave must satisfy the policy of the enclave. Enclaves can be specific to an organization or a mission and may also contain multiple networks. They may be logical, such as an operational area network (OAN), or be based on physical location and proximity. The enclave encompasses both the network layer and the host and applications layer."