Definitions from Wiktionary (DOS)

▸ noun:  (computing, Internet) A denial-of-service attack.
▸ verb:  (transitive, computing, Internet) To commit a denial-of-service attack against.
▸ noun:  (teaching) Director of Studies; someone in charge of the academic side of a school including training teachers and deciding course materials.
▸ noun:  (military) Initialism of date of service.
▸ noun:  (military) Initialism of date of separation.
▸ noun:  (computing, Internet) Initialism of denial of service. [(Internet) A denial-of-service attack.]
▸ noun:  (sciences) Initialism of density of states.
▸ noun:  (education) Initialism of director of studies.
▸ noun:  (emergency services) Initialism of death on scene.
▸ noun:  (computing, historical) Acronym of Disk Operating System, a family of disk-based operating systems.
▸ noun:  (US politics) Initialism of Department of State.

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