"mainframe" in the noun sense

1. mainframe, mainframe computer

a large digital computer serving 100-400 users and occupying a special air-conditioned room

2. central processing unit, CPU, C.P.U., central processor, processor, mainframe

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"

Source: WordNet® (An amazing lexical database of English)

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