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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Junction Field Effect Transistor
   JFET
   Junction FET
      <electronics> (JFET, Junction FET) A Field Effect Transistor
      in which the conducting channel lies between pn junctions in
      the silicon material.  A pn junction acts as a diode, so it
      becomes conductive if the gate voltage gets reversed.
      (1997-02-24)