Source : Webster's Revised Unabridged Dictionary (1913)

Bon \Bon\, a. [F., fr. L. bonus.]
   Good; valid as security for something.

Source : Free On-Line Dictionary of Computing

bon
     
         (From "Bonnie", {Ken Thompson}'s wife) A language
        designed by {Ken Thompson} and later revised by him to produce
        {B}.
     
        [When?  Features?]
     
        (1997-02-04)