The Collaborative International Dictionary of English v.0.48:

Through \Through\, a.
   Going or extending through; going, extending, or serving from
   the beginning to the end; thorough; complete; as, a through
   line; a through ticket; a through train. Also, admitting of
   passage through; as, a through bridge.
   [1913 Webster]

   Through bolt, a bolt which passes through all the thickness
      or layers of that which it fastens, or in which it is
      fixed.

   Through bridge, a bridge in which the floor is supported by
      the lower chords of the tissues instead of the upper, so
      that travel is between the trusses and not over them. Cf.
      Deck bridge, under Deck.

   Through cold, a deep-seated cold. [Obs.] --Holland.

   Through stone, a flat gravestone. [Scot.] [Written also
      through stane.] --Sir W. Scott.

   Through ticket, a ticket for the whole journey.

   Through train, a train which goes the whole length of a
      railway, or of a long route.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Through \Through\, prep. [OE. thurgh, [thorn]urh, [thorn]uruh,
   [thorn]oruh, AS. [thorn]urh; akin to OS. thurh, thuru,
   OFries. thruch, D. door, OHG. durh, duruh, G. durch, Goth.
   [thorn]a['i]rh; cf. Ir. tri, tre, W. trwy. [root]53. Cf.
   Nostril, Thorough, Thrill.]
   1. From end to end of, or from side to side of; from one
      surface or limit of, to the opposite; into and out of at
      the opposite, or at another, point; as, to bore through a
      piece of timber, or through a board; a ball passes through
      the side of a ship.
      [1913 Webster]

   2. Between the sides or walls of; within; as, to pass through
      a door; to go through an avenue.
      [1913 Webster]

            Through the gate of ivory he dismissed
            His valiant offspring.                --Dryden.
      [1913 Webster]

   3. By means of; by the agency of.
      [1913 Webster]

            Through these hands this science has passed with
            great applause.                       --Sir W.
                                                  Temple.
      [1913 Webster]

            Material things are presented only through their
            senses.                               --Cheyne.
      [1913 Webster]

   4. Over the whole surface or extent of; as, to ride through
      the country; to look through an account.
      [1913 Webster]

   5. Among or in the midst of; -- used to denote passage; as, a
      fish swims through the water; the light glimmers through a
      thicket.
      [1913 Webster]

   6. From the beginning to the end of; to the end or conclusion
      of; as, through life; through the year.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Through \Through\, adv.
   1. From one end or side to the other; as, to pierce a thing
      through.
      [1913 Webster]

   2. From beginning to end; as, to read a letter through.
      [1913 Webster]

   3. To the end; to a conclusion; to the ultimate purpose; as,
      to carry a project through.
      [1913 Webster]

   Note: Through was formerly used to form compound adjectives
         where we now use thorough; as, through-bred;
         through-lighted; through-placed, etc.
         [1913 Webster]

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

   To fall through. See under Fall, v. i.
      [1913 Webster]
      [1913 Webster]

WordNet (r) 3.0 (2006):

through
    adv 1: from beginning to end; "read this book through"
    2: over the whole distance; "this bus goes through to New York"
    3: to completion; "think this through very carefully!"
    4: in diameter; "this cylinder measures 15 inches through"
    5: throughout the entire extent; "got soaked through in the
       rain"; "I'm frozen through"; "a letter shot through with the
       writer's personality"; "knew him through and through";
       "boards rotten through and through" [syn: through, through
       and through]
    adj 1: having finished or arrived at completion; "certain to
           make history before he's done"; "it's a done deed";
           "after the treatment, the patient is through except for
           follow-up"; "almost through with his studies" [syn:
           done, through, through with(p)]
    2: (of a route or journey etc.) continuing without requiring
       stops or changes; "a through street"; "a through bus";
       "through traffic"

Moby Thesaurus II by Grady Ward, 1.0:

101 Moby Thesaurus words for "through":
   SOL, all bets off, all off, all over, all through, all up, around,
   at about, at an end, because of, breadthwise, broad side foremost,
   broadside, broadways, broadwise, by, by dint of, by means of,
   by use of, by virtue of, by way of, canceled, cleaned up, complete,
   completed, completely, concluded, dead, decided, defunct, deleted,
   depthwise, done, done for, done with, down, due to, durante,
   during, ended, entirely, expunged, extinct, fini, finished,
   finished up, fully, hereby, herewith, in all respects,
   in virtue of, including, inclusive of, into, kaput, on,
   on account of, over, owing to, passing by, passing through, past,
   pending, per, perfected, perfective, round, round about,
   set at rest, settled, shot, sideways, sidewise, straight,
   straightforward, terminated, thanks to, thereby, therewith,
   thoroughly, through and through, through with, throughout, to,
   totally, uninterrupted, upon, utterly, via, washed up, whereby,
   wherewith, wherewithal, wholly, widthways, widthwise, wiped out,
   with, wound up, wrapped up, zapped