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legacy system

   Also found in: Wikipedia, Hutchinson 0.10 sec.

legacy system

An older computer system such as a mainframe or minicomputer. It may also refer to only the software (see legacy application).

(jargon)legacy system - A computer system or application program which continues to be used because of the cost of replacing or redesigning it and often despite its poor competitiveness and compatibility with modern equivalents. The implication is that the system is large, monolithic and difficult to modify.

If legacy software only runs on antiquated hardware the cost of maintaining this may eventually outweigh the cost of replacing both the software and hardware unless some form of emulation or backward compatibility allows the software to run on new hardware.


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The hardware provides full backwards software compatibility with the company's previous APC control cabinets so that profile control upgrades can easily be made to any legacy system from the company.
Extrusion profile control by Rubber World
They must realize success is the result of individual choices, such as what to do with a legacy system and whether to build or buy.
Big bang, small bucks by Best's Review
The Nevada DMV's new client-server architecture information system with GUI interfaces was put into use in September, 1999 and as of September, 2000, the system was still slower than the old mainframe-based legacy system in terms of average transaction time.
A case study of Nevada DMV system by Lee, Ook / Journal of Academy of Business and Economics
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