the time during which a machine or piece of equipment, as a computer, is operating or can be operated.
the time during which an employee is actually working.
Compare downtime.

1955–60; up (in sense “operating”) + time

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
uptime (ˈʌpˌtaɪm)
commerce time during which a machine, such as a computer, actually operates

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The vendor shall maintain a stock level capable of supplying a part to meet the necessary response time and uptime guarantees.
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