mainframe

Computer hardware, Computing, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences A large, powerful computer able to manage very many simultaneous tasks and communicate with very many connected terminals; used by large, complex organizations (such as banks and supermarkets) where continuously sustained operation is vital.

Computer hardware, Computing, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences A computer chassis that hosts and interconnects modules that perform various tasks.

The main frame of a vehicle etc., more commonly main frame.