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The Collaborative International Dictionary of English v.0.48 (gcide)

CPU \CPU\, cpu \c.p.u.\n. abbr.
1. (Computers) The {central processing unit}, that part of
the electronic circuitry of a computer in which the
arithmetic and logical operations are performed on input
data, which are thereby converted to output data; it is
usually located on the mainboard, or motherboard, of a
computer. The CPU and the memory form the central part of
a computer to which the peripherals are attached. Most
personal computers as of 1998 had only one CPU, but some
computers may have more than one CPU. [acronym]

Syn: central processing unit, CPU, C.P.U., central processor,
processor.
[WordNet 1.5 PJC]