An operating system that resides on a disk.
Plural form of do.
(teaching) Director of Studies; someone in charge of the academic side of a school including training teachers and deciding course materials.
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.
Origin of DOS
d(isk) o(perating) s(ystem)
From American Heritage Dictionary of the English Language, 5th Edition
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