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essential to the functioning or success of a specific operation, project, or system
- The software update is mission-critical for ensuring the system's security.
- The backup servers are mission-critical to prevent downtime during emergencies.
- This task is mission-critical, so it must be completed before the deadline.
- The pilot emphasized that the pre-flight checklist is mission-critical for safety.
- For the spacecraft to succeed, its navigation system is absolutely mission-critical.