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operational research
operationalism
operationalize
operationism
operations management
operations research
operatise
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operating system
op·er·at·ing sys·tem (plural op·er·at·ing sys·tems)


noun 
Definition:
 
master control program in computer: the essential program in a computer that maintains disk files, runs applications, and handles devices such as the mouse and printer
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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