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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   AXLE
      <language> An early string processing language in which a
      program consists of an "assertion table" specifying patterns
      and an "imperative table" specifying replacements.
      ["AXLE: An Axiomatic Language for String Transformations",
      K. Cohen et al, CACM 8(11):657-661, Nov 1965].
      (2009-02-10)