Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The time during which a device, such as a computer, is functioning or available for use.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The period of time a computer has functioned since last requiring a reboot.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a period of time when something (as a machine or factory) is functioning and available for use

Etymologies

up (adjective, computing) + time (Wiktionary)

Examples

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