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Uninterruptable Power Source
Definition: (UPS) A power supply containing a rechargeable battery source that will maintain a constant supply of power to a computer or other electronic system in case electrical power fluctuates or fails. A UPS can prevent accidental shutdown or data loss.
Source: High Definition: A-Z Guide to Personal Technology. Boston: Houghton Mifflin, 2006. Credo Reference. Web. 03 August 2012.