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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   ADL
      1. <games> Adventure Definition Language.
      2. <language> Ada Development Language.
      R.A. Lees, 1989.
      3. <programming> API Definition Language.
      A project for Automatic Interface Test Generation.
      (1995-11-17)