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English definition of “operating system”

operating system

noun [C]
 
 
( abbreviation OS, O/S) IT
a program that controls the way a computer works, and that allows applications (= programs for particular purposes) to work on it: a computer/PC operating system A leading economist denied that the firm has a monopoly in the PC operating system market.
(Definition of operating system from the Cambridge Business English Dictionary © Cambridge University Press)
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