What we're actually talking about here is "The Department of Defense (DoD) Information Assurance Certification and Accreditation Process (DIACAP)."
DIACAP can be defines as a DoD-wide formal and standard set of actions, general tasks and a basic management infrastructure process in order to certify and accredit the maintenance of the IA, or to give it its full title, the information assurance throughout the system's life cycle.