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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   ExTendible Compiler
   ETC
      <language> (ETC) A Fortran-like compiler that can be
      extended with macros.
      ["ETC - An Extendible Macro-Based Compiler", B.N. Dickman,
      Proc SJCC 38 1971].
      (2010-01-28)