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A mainframe is

[a]n industry term for a large computer, typically used for the commercial applications of businesses and other large-scale computing purposes. Generally, a mainframe is associated with centralized rather than distributed computing.[1]
[a] large computer[] that [is] capable of supporting thousands of simultaneous users. Although historically they have been associated with centralized computing, today's mainframes can be used in networks to serve distributed users and smaller servers.[2]

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