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- Dictionarydown·time/ˈdounˌtīm/
noun
- 1. time during which a machine, especially a computer, is out of action or unavailable for use.
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noun
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Period when a system is unavailable or unable to provide or perform its primary function
The term downtime is used to refer to periods when a system is unavailable. The unavailability is the proportion of a time-span that a system is unavailable or offline. This is usually a result of the system failing to function because of an unplanned event, or because of routine maintenance (a planned event). Wikipedia