The quality of being dependable and able to be trusted to work or behave as expected.
From *reliable* plus the noun suffix *-ity*. *Reliable* comes from *rely* and originally meant “that can be relied on,” turning a verb of trust into a trait.
Reliability is really about being predictably boring in the best way possible. People and systems become ‘reliable’ when their surprises are rare—and usually pleasant.
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