Dos meaning

dŏs, dôs
Any of a family of operating systems that use command lines and were originally developed for personal computers made by IBM.
noun
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An operating system that resides on a disk.
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A generic term describing an operating system (OS) that loads from a disk device when the computer system is turned on. Earlier, more primitive OSs loaded from magnetic tape or even paper tape, or were resident in memory. See also OS.
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Plural form of do.
noun
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(computing, Internet) Denial of Service.
abbreviation
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(teaching) Director of Studies; someone in charge of the academic side of a school including training teachers and deciding course materials.
abbreviation
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Referring to MS-DOS (MicroSoft Disk Operating System), a single-user, single-tasking OS released in 1981 for use in IBM personal computers (PCs) and compatibles. See also OS and PC.
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Origin of dos

  • d(isk) o(perating) s(ystem)

    From American Heritage Dictionary of the English Language, 5th Edition