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upwind
Ur
ur- (1)
ur- (2)
uracil
uraemia
uraeus
Ural
Ural-Altaic
Ural Mountains
Uralian
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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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