1. (可同时供多人使用或进行复杂计算的)大型计算机
A mainframe or mainframe computer is a large powerful computer which can be used by many people at the same time and which can do very large or complicated tasks.

1. (computer science) the part of a computer (a microprocessor chip) that does most of the data processing

e.g. the CPU and the memory form the central part of a computer to which the peripherals are attached

Synonym: central processing unitCPUC.P.U.central processorprocessor

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

Synonym: mainframe computer