From Longman Dictionary of Contemporary Englishopen systemˈopen ˌsystem noun [countable] technical TDa computer system that can be connected with similar computer systems made by other companiesFrom Longman Business Dictionaryopen systemˈopen ˌsystem [countable]COMPUTING a computer system on which you can use APPLICATIONs (=programs for particular uses) that were designed to work on other systemsThey are moving from mainframes to open systems that can link payroll with other human resources functions. → system
