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What does DOS mean?

Looking for the meaning or definition of the word DOS? Here's what it means.

Proper noun
  1. (computing) Acronym of Disk Operating System., especially: a collective term for disk(ette)-based operating systems (PC-DOS, MS-DOS, DR-DOS, Novell DOS, FreeDOS) available for IBM and IBM-compatible personal computers from the early 1980's, although the term was used before then to refer to any disk-based operating system (such as the Data General "Diskette Operating System" for their minicomputers, or for the TRS-80 DOS used when the computer was upgraded from cassette data storage to diskette).
Initialism
  1. (military) Date(s) of service
  2. (military) Date of separation
  3. (US) Department of State
  4. (sciences) Density of states
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