(1) A collection of related and connected CICS regions, which helps to address the inefficiencies in having multiple, full-function CICS systems processing a single OLTP workload. See also multiregion operation.
(2) The largest set of CICS regions, or systems, to be manipulated by CICSPlex SM as a single entity. CICS systems in a CICSplex being managed by CICSPlex SM do not need to be connected to each other.