from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Slang An antiaircraft gun.
  • n. Slang Antiaircraft fire.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Antiaircraft artillery.
  • n. Antiaircraft fire
  • adj. Of or relating to antiaircraft warfare.

from the GNU version of the Collaborative International Dictionary of English

  • n. Artillery designed to shoot upward at airplanes; antiaircraft artillery.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. artillery designed to shoot upward at airplanes


from The American Heritage® Dictionary of the English Language, 4th Edition

British telephone code for AA, abbreviation for antiaircraft.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From ack ("A") + ack ("A"), RAF WWI signalese for AA ("anti-aircraft"). (In modern signalese it would be called alpha-alpha.)


  • Studying this catalog of wicked devices, Jane observed herself beginning to undergo that change from rookie to hardened field veteran, barely flinching at the sound of ack-ack guns coming from next door, where soldiers practiced shooting at a towed target.

    A Covert Affair

  • Three of us who had talked escape, Mullins, Ford and myself, took off in the pandemonium of ack-ack, bombs, strafing and napalm that hit a nearby building.

    Heroes or Villains?

  • My favorite was one I painted with a white and blue belly so it was camouflaged to look like clouds and sky to the Nazi ack-ack gunners below.

    Moving metal, sniffing glue

  • Though when he tells the Iranians about shooting down their planes, I would like him to specify that it's not the United States, necessarily doing it, and it's certainly not me, but it's himself, Newt Gingrich, the John Wayne of WWIII, who will be behind the ack-ack gun.

    Larry Beinhart: Ah, World War III, Newt Gingrich is Calling You

  • After an hour of the deafening ack-ack of the engine, we arrived at the muddy coast of Moheshkhali.

    Johann Hari: A Journey Across the Ground Zero of Global Warming

  • Through the battered century of world wars and massive violence by other means, there had always been an undervoice that spoke through the cannon fire and ack-ack and that sometimes grew strong enough to merge with the battle sounds.


  • Quick cut to the skies: lumbering bombers releasing their payloads over sprawling cities, while fighters dart in and out around them and black clouds of ack-ack explode with sudden menace.

    All-Day Permanent Red: Alex Cox and the Long March of American Militarism

  • He gave us…the whole ack-ack and locator defense system of southern Austria between Udine in Italy and Vienna in Austria.

    Operatives, Spies, and Saboteurs

  • Accordingly, Wynberg sent the following message on his W/T: Assembled at Hall and Innsbruck and west 26 trains 30 to 40 cars each loaded with ammo, tractors, ack-ack guns, gasoline, light equipment, leaving for Italy via Brenner April 3 after twenty one hundred GMT.

    Operatives, Spies, and Saboteurs

  • A German intelligence officer of ack-ack Regiment No. 76, stationed in Vienna, deserted to the Partisans.

    Operatives, Spies, and Saboteurs


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  • My resort to a well known search engine for info on British telephone code yielded not ack-ack, but 44! In this instance Wordnik's etymologies (alpha+) are more helpful than its definitions, which appear restrictively current.

    July 9, 2013

  • "It was a mixed day of planes, one moment Jerry, then the RAF, then Jerry. The Ack-Ack boys took no chances and fired at the lot. The Major was nearly out of mind by day's end trying to co-ordinate our efforts for maximum retaliation."

    - Spike Milligan, 'Mussolini: My Part In His Downfall.'

    April 19, 2009