- The changes that occur over time in a substance, material, component, device, piece of equipment, or system. Also, changes in certain parameters, performance, or properties due to the passage of time. The level of use and/or the surrounding conditions influence significantly.
- operation of a component, circuit, device, piece of equipment, or system, under controlled conditions for a specified time, to stabilize its characteristics and to screen out failures. For example, the burning-in of an electronic device.
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