Mainframe computers (colloquially referred to as `big iron`) are computers used primarily by corporate and governmental organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning and transaction processing. The term originally referred to the large cabinets called .....
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http://en.wikipedia.org/wiki/Mainframe_computer
mainframe computer A large, powerful, high-speed computer frequently used as the central computer at an institution or company, or government agency.
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http://www.wordinfo.info/words/index/info/view_unit/1803/4
noun a large digital computer serving 100-400 users and occupying a special air-conditioned room
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https://www.encyclo.co.uk/local/20974
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