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In telecommunication, the term maintainability has the following meanings:

1. A characteristic of design and installation, expressed as the probability that an item will be retained in or restored to a specified condition within a given period of time, when the maintenance is performed in accordance with prescribed procedures and resources.

2. The ease with which maintenance of a functional unit can be performed in accordance with prescribed requirements.

Source: from Federal Standard 1037C and from MIL-STD-188