In general, reliability (systemic def.) is an ability of a system to perform/maintain its functions in routine and also in different hostile or/and unexpected circumstances.

In natural language it may also denotes persons which acts efficiently in proper moments/circumstances (infallibile).

Reliability may refer to:

• Reliability (statistics), of a set of data
• Experimental reliability of an experiment.
• Reliabilism in philosophy and epistemology
• Data reliability, a property of some disk arrays in computer storage.
• Reliability engineering ensures a system will be reliable when operated in a specified manner
• Reliability theory, as a theoretical concept, to explain biological aging and species longevity
• For telecommunications, see unreliable.
• Reliability (computer networking) is a category used to describe protocols.

Reliabilität | Fiabilité | Niezawodność | Надёжность | Reliability