Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation attention deficit disorder

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism Attention deficit disorder.
  • initialism Accidental death and dismemberment.
  • initialism A designation on prerecorded compact discs indicating that the contents were recorded in analog but mixed and mastered in digital; compare AAD, DAD, DDD.

Etymologies

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