mainframe

noun Computers.

1. a large computer, often the hub of a system serving many users.

noun

1. 1. a high-speed general-purpose computer, usually with a large storage capacity
   2. (as modifier)mainframe systems
2. the central processing unit of a computer

n.“central processor of a computer system,” 1964, from main (adj.) + frame (n.).

1. A large, often powerful computer, usually dedicated to lengthy, complex calculations or set up for use by many people simultaneously. Compare personal computer.

A large, powerful computer system. A mainframe computer typically carries out complex calculations and is shared by many users. (Compare personal computer.)