1. author’s alteration.

  1. Alcoholics Anonymous.
  2. antiaircraft.
  3. antiaircraft artillery.
  4. Associate in Accounting.
  5. Associate of Arts.
  6. author’s alteration.

also AA, abbreviation of Alcoholics Anonymous, attested by 1941, American English. The group name was the title of a book published in 1938 by the founder, Bill W.

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