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Definition of Downtime
1. Noun. A period of time when something (as a machine or factory) is not operating (especially as a result of malfunctions). 
Definition of Downtime
1. the time when a machine or factory is inactive [n -S]
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1. Noun. A period of time when something (as a machine or factory) is not operating (especially as a result of malfunctions). 
1. the time when a machine or factory is inactive [n -S]