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Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Flange \Flange\, v. t. [imp. & p. p. Flanged (fl[a^]njd); p.
      pr. & vb. n. Flanging (fl[a^]n"j[i^]ng).] (Mach.)
      To make a flange on; to furnish with a flange.
      [1913 Webster]