mainframe
n.n. a very large, powerful computer that handles many tasks at once for a big company or government. It is usually much bigger and more powerful than the computers you use at home.
n. a large, powerful computer system that serves as the central repository for an organization's data and processing needs. Often used in the context of enterprise computing or high-performance computing environments.
The company uses a mainframe to manage all its customer data.
Despite the rise of cloud computing, many banks still rely on a mainframe to process millions of transactions every second.
The transition from a traditional mainframe to a distributed cloud architecture required a complete overhaul of the organization's legacy software and security protocols.
From main + frame.