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upswing
upsy-daisy
uptake
uptalk
upthrow
upthrust
uptick
uptight
uptime
uptown
uptrend
upturn
upward
upward mobility
upwardly mobile
upwelling
upwind
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uptime
up·time [ úp tm ]


noun 
Definition:
 
operating time: the time during which a computer or other machine is operating or ready for use
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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