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reliability
This term describes a state of predictability and stability. It is the mental comfort of knowing that a person or a machine will not fail when needed. In engineering, it refers to the probability that a system will function without failure over a specific period. In social contexts, it carries a strong moral weight. A reliable person is viewed as dependable and honest, whereas a lack of reliability is often equated with flaky behavior or professional incompetence. It is more about the consistency of performance than the high quality of a single act.
Used as an abstract quality of a person or a device, such as saying a car has high reliability.
Meanings
The quality of being trustworthy or performing consistently well.
"The reliability of the old truck is surprising."