Source : Webster's Revised Unabridged Dictionary (1913)

Random \Ran"dom\, a.
   Going at random or by chance; done or made at hazard, or
   without settled direction, aim, or purpose; hazarded without
   previous calculation; left to chance; haphazard; as, a random
   guess.

         Some random truths he can impart.        --Wordsworth.

         So sharp a spur to the lazy, and so strong a bridle to
         the random.                              --H. Spencer.

   {Random courses} (Masonry), courses of unequal thickness.

   {Random shot}, a shot not directed or aimed toward any
      particular object, or a shot with the muzzle of the gun
      much elevated.

   {Random work} (Masonry), stonework consisting of stones of
      unequal sizes fitted together, but not in courses nor
      always with flat beds.