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- The reliability of a system or software subsystem in its actual use environment. Operational reliability may differ considerably from reliability in the nonoperational or test environment.
DoD Missile Defense Agency - Cite This Source - This Definition
- Ilities, Operational Suitability, Q\&R, R\&A, R i, RAM, RAMA, RAMOS, Redundancy, Reliability, Availability, and Maintainability (RAM), RIW