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1. A large digital computer serving 100-400 users and occupying a special air-conditioned room
   - mainframe computer
    
2. (computing) the part of a computer (a microprocessor chip) that does most of the data processing
   "the mainframe and the memory form the central part of a computer to which the peripherals are attached";
   - central processing unit, CPU, C.P.U., central processor, processor

Derived forms: mainframes

Type of: computer hardware, digital computer, electronic equipment, hardware

Part of: computer, computing device, computing machine, data processor, electronic computer, information processing system

Encyclopedia: Mainframe