Source : Webster's Revised Unabridged Dictionary (1913)

Through \Through\, adv.
   1. From one end or side to the other; as, to pierce a thing
      through.

   2. From beginning to end; as, to read a letter through.

   3. To the end; to a conclusion; to the ultimate purpose; as,
      to carry a project through.

   Note: Through was formerly used to form compound adjectives
         where we now use thorough; as, through-bred;
         through-lighted; through-placed, etc.

   {To drop through}, to fall through; to come to naught; to
      fail.

   {To fall through}. See under {Fall}, v. i.