Definition of Operational requirements document

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Operational requirements document Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
A formatted statement containing performance and related operational parameters for the proposed concept or system. Prepared by the user or user’s representative at each milestone beginning with Milestone I, Concept Demonstration Approval of the Requirements Generation Process. Also called ORD.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )