Source : Webster's Revised Unabridged Dictionary (1913)

Tron \Tron\, n.
   See 3d {Trone}, 2. [Obs. or Scott.]

Source : Free On-Line Dictionary of Computing

TRON
     
        1.  {The Real-Time Operating System Nucleus}.
     
        2.  (TRace ON) A
        {command} used when {debugging} {programs} written in
        early {line-numbered} {BASIC} that contained {GOTO} and
        {GOSUB} statements.
     
        When the TRON command had been {executed}, the program ran
        with a {window} open indicating the line number being
        executed at that instant.
     
        The {TROFF} (an abbreviation for "TRace OFF") command turned
        the {tracing} off.
     
        (2003-02-02)

tron
     
         ({NRL}, {CMU}, probably from the film "Tron") To
        become inaccessible except via {electronic mail} or {talk}
        especially when one is normally available via telephone or in
        person.
     
        Compare {spod}.
     
        [{Jargon File}]
     
        (1994-11-03)