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uptime

[uhp-tahym] /ˈʌpˌtaɪm/
noun
1.
the time during which a machine or piece of equipment, as a computer, is operating or can be operated.
2.
the time during which an employee is actually working.
Compare downtime.
Origin
1955-1960
1955-60; up (in sense “operating”) + time
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for up time

uptime

/ˈʌpˌtaɪm/
noun
1.
(commerce) time during which a machine, such as a computer, actually operates
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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