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Definition:

[noun] a large digital computer serving 100-400 users and occupying a special air-conditioned room
Synonyms: computer
[noun] (computer science) the part of a computer (a microprocessor chip) that does most of the data processing; the CPU and the memory form the central part of a computer to which the peripherals are attached
Synonyms: central processing unit, CPU, C.P.U., central processor, processor