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uninterruptible power supply

un·in·ter·rupt·i·ble pow·er sup·ply [ ùnnintə rùptəb'l pówr sə pl ]


noun 
Definition:
 
source of power during power failure: a piece of electrical equipment with internal batteries that provides a continuing source of power for a short period of time during a power failure to a computer or electrical appliance that is plugged into it

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