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The time during which a computer is operational. For some reason, the uptime counter on my PC hasn't been resetting when I shut it down, so it says it's been running for four days straight.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. the time when a computer is running. (Compare this with down time.) On some systems the down time is longer than the up time.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.