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" ;