2. A written plan for recovering one or more information systems at an alternate facility in response to a major hardware or software failure or destruction of facilities.
Sources:
CNSSI 4009-2015 under disaster recovery plan (DRP) from NIST SP 800-34 Rev. 1

  Management policy and procedures used to guide an enterprise response to a perceived loss of mission capability. The Contingency Plan is the first plan used by the enterprise risk managers to determine what happened, why, and what to do. It may point to the continuity of operations plan (COOP) or disaster recovery plan (DRP) for major disruptions.
Sources:
CNSSI 4009-2015

  Management policy and procedures used to guide an enterprise response to a major loss of enterprise capability or damage to its facilities. The DRP is the second plan needed by the enterprise risk managers and is used when the enterprise must recover (at its original facilities) from a loss of capability over a period of hours or days.
Sources:
CNSSI 4009-2015 under disaster recovery plan (DRP)

  A plan that is maintained for disaster response, backup operations, and post-disaster recovery to ensure the availability of critical resources and to facilitate the continuity of operations in an emergency situation.
Sources:
NIST SP 800-57 Part 1 Rev. 5 under Contingency plan