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1. (n.) operating system
the software that directs a computer's operations, as by controlling and scheduling the execution of other programs and managing storage and input/output.
Etymology: (1960–65)
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| Definition of 'operating system' |
Princeton's WordNet |
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1. (noun) operating system, OS
(computer science) software that controls the execution of computer programs and may provide various services
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| Definitions of 'operating system' |
The New Hacker's Dictionary |
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1. operating system
[techspeak] (Often abbreviated ‘OS’) The foundation
software of a machine; that which schedules tasks, allocates storage, and
presents a default interface to the user between applications. The
facilities an operating system provides and its general design philosophy
exert an extremely strong influence on programming style and on the
technical cultures that grow up around its host machines. Hacker folklore
has been shaped primarily by the Unix,
ITS, TOPS-10,
TOPS-20/TWENEX,
WAITS, CP/M,
MS-DOS, and Multics operating
systems (most importantly by ITS and Unix). See also
timesharing.
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Definitions of operating system 
