availability | The fraction of time a piece of equipment is expected to be available for operation.
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independent events | Events whose occurrence or nonoccurrence does not influence each other.
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mean time between failures (MTBF) | The average length of time between failures of a product or component.
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redundancy | The use of backup components to increase reliability.
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reliability | The ability of a product, part, or system to perform its intended function under a prescribed set of conditions.
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