Definition: dos

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Source: WordNet (r) 1.7 

DOS
     n : an operating system that is on a disk [syn: DOS, disk
         operating system]

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

DOS

   <operating system> 1. The common abbreviation for MS-DOS.

   2. IBM's Disk Operating System.

   3. Any disk operating system.

   (2001-03-16)

Source: V.E.R.A. -- Virtual Entity of Relevant Acronyms December 2001 

DOS
        Denial Of Service [attack], "DoS"
DOS
        Disk Operating System (OS, IBM, MS, ..., PC, Apple, RCA Spectra 70)