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disk operating system

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noun Computers.
DOS.
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British Dictionary definitions for disk operating system

disk operating system

noun
an operating system used on a computer system with one or more disk drivesOften shortened to: DOS
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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