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Definition: large computer that supports a number of smaller computers or terminals that are connected to it via a network. Hosts may be mainframe computers that service large number of terminals or green screens, or, for example, Internet hosts that serve Web pages and files to personal computers attached via the Internet.
Source: Hutchinson Dictionary of Computing and the Internet. Abingdon, Oxfordshire, GBR: Helicon Publishing, 2005. p 268.