GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ack-ack n. [from AA, meaning antiaircraft pronounced ack-ack by British signalmen.] (Mil.) Artillery designed to shoot upward at airplanes; antiaircraft artillery.
   
   Syn. -- antiaircraft, antiaircraft gun, flak, pompom, pom-pom, ack-ack gun
   
   [WordNet 1.5 +PJC]