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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   ADELE
      <language> A language for specification of attribute
    grammars, used by the MUG2 compiler compiler.
      ["An Overview of the Attribute Definition Language ADELE",
      H. Ganziger in GI3, Fachesprach "Compiler-Compiler",
      W. Henhapl ed, Munchen Mar 1982, pp.22-53].
      (1995-01-23)