Source : Webster's Revised Unabridged Dictionary (1913)

Rogue \Rogue\, n. [F. rogue proud, haughty, supercilious; cf.
   Icel. hr?kr a rook, croaker (cf. {Rook} a bird), or Armor.
   rok, rog, proud, arogant.]
   1. (Eng.Law) A vagrant; an idle, sturdy beggar; a vagabond; a
      tramp.

   Note: The phrase rogues and vagabonds is applied to a large
         class of wandering, disorderly, or dissolute persons.
         They were formerly punished by being whipped and having
         the gristle of the right ear bored with a hot iron.

   2. A deliberately dishonest person; a knave; a cheat.

            The rogue and fool by fits is fair and wise. --Pope.

   3. One who is pleasantly mischievous or frolicsome; hence,
      often used as a term of endearment.

            Ah, you sweet little rogue, you!      --Shak.

   4. An elephant that has separated from a herd and roams about
      alone, in which state it is very savage.

   5. (Hort.) A worthless plant occuring among seedlings of some
      choice variety.

   {Rogues' gallery}, a collection of portraits of rogues or
      criminals, for the use of the police authorities.

   {Rogue's march}, derisive music performed in driving away a
      person under popular indignation or official sentence, as
      when a soldier is drummed out of a regiment.

   {Rogue's yarn}, yarn of a different twist and color from the
      rest, inserted into the cordage of the British navy, to
      identify it if stolen, or for the purpose of tracing the
      maker in case of defect. Different makers are required to
      use yarns of different colors.

Rogue \Rogue\, v. i.
   To wander; to play the vagabond; to play knavish tricks.
   [Obs.] --Spenser.

Rogue \Rogue\, v. t.
   1. To give the name or designation of rogue to; to decry.
      [Obs.] --Cudworth.

   2. (Hort.) To destroy (plants that do not come up to a
      required standard).

Source : WordNet®

rogue
     n : a deceitful and unreliable scoundrel [syn: {knave}, {rascal},
          {rapscallion}, {scalawag}, {scallywag}, {varlet}]

Source : Free On-Line Dictionary of Computing

rogue
     
         [Unix] A Dungeons-and-Dragons-like game using
        character graphics, written under BSD Unix and subsequently
        ported to other Unix systems.  The original BSD "curses(3)"
        screen-handling package was hacked together by Ken Arnold to
        support "rogue(6)" and has since become one of Unix's most
        important and heavily used application libraries.  Nethack,
        Omega, Larn, and an entire subgenre of computer dungeon games
        all took off from the inspiration provided by "rogue(6)".  See
        also {nethack}.
     
        [{Jargon File}]