mainframe > define

noun

• A large digital computer serving 100-400 users and occupying a special air-conditioned room.
  • synonyms: mainframe computer
• Computer science) the part of a computer (a microprocessor chip) that does most of the data processing. (
  • usage: "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