ASHRAE Terminology

A Comprehensive Glossary of Terms for the Built Environment
ashrae.org/ashraeterms

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reliability

(1) mathematical probability that a device will perform its objective adequately for the period of time intended under the operating conditions specified. (2) probability that a device will function without failure over a specified time period or amount of usage. See accuracy, precision, repeatability. (3) probability that an instrument’s repeatability and accuracy will continue to fall within specified limits.