Dos

//diː oː ˈɛs// name, noun, verb

name, noun, verb ·Moderate ·College level

Definitions

Noun
  1. 1
    Initialism of date of service. abbreviation, alt-of, initialism
  2. 2
    plural of do form-of, plural

    "With the coming of Monday arrived a new life for David—a curious life full of "don'ts" and "dos." David wondered sometimes why all the pleasant things were "don'ts" and all the unpleasant ones "dos.""

  3. 3
    plural of do form-of, plural

    "In functional harmonic progression, three “Dos” in a row within the Do-Ti test indicate chord changes that can only be this descending third pattern."

  4. 4
    A denial-of-service attack. Internet
  5. 5
    A Director of Studies; someone who oversees the scholarly aspects of an institution, including faculty development and curriculum design.
Show 8 more definitions
  1. 6
    an operating system that is on a disk wordnet
  2. 7
    Initialism of date of separation. abbreviation, alt-of, initialism
  3. 8
    the federal department in the United States that sets and maintains foreign policies wordnet
  4. 9
    Initialism of denial of service. Internet, abbreviation, alt-of, initialism
  5. 10
    Initialism of density of states. abbreviation, alt-of, initialism
  6. 11
    Initialism of director of studies. abbreviation, alt-of, initialism
  7. 12
    Initialism of disk operating system abbreviation, alt-of, initialism
  8. 13
    Initialism of death on scene. abbreviation, alt-of, initialism
Verb
  1. 1
    To commit a denial-of-service attack against. Internet, transitive

    "In addition to out-of-spec traffic, malicious packets can contain payloads that cause a system to crash. A packet's payload is taken as input into a service. If the input is not properly checked, the application can be DoSed."

Proper Noun
  1. 1
    Acronym of Disk Operating System, a family of disk-based operating systems. abbreviation, acronym, alt-of, historical

    "Next, using your word processor or the DOS text editor, you can edit your AUTOEXEC.BAT file."

  2. 2
    Initialism of Department of State. US, abbreviation, alt-of, initialism

Antonyms

All antonyms

Example

More examples

"This program cannot be run in DOS mode."

Etymology

From denial of service.

Related phrases

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.