Source : Webster's Revised Unabridged Dictionary (1913)

Though \Though\ ([th][=o]), conj. [OE. thogh, [thorn]ah, AS.
   [eth]e['a]h, [eth][=ae]h, [eth][=e]h; akin to OS. th[=o]h,
   OFries. thach, D. & G. doch but, yet, OHG. doh but, yet
   though, Icel. [thorn][=o] yet, nevertheless, Sw. dock, Dan.
   dog, Goth. [thorn]['a]uh, [thorn]['a]u, than, or, yet; of
   uncertain origin. [root]184.]
   Granting, admitting, or supposing that; notwithstanding that;
   if.

         Though he slay me, yet will I trust in him. --Job xiii.
                                                  15.

         Not that I so affirm, though so it seem. --Milton.

   Note: It is compounded with all in although. See {Although}.

   {As though}, as if.

            In the vine were three branches; and it was as
            though it budded.                     --Gen. xl. 10.

Though \Though\, adv.
   However; nevertheless; notwithstanding; -- used in familiar
   language, and in the middle or at the end of a sentence.

         I would not be as sick though for his place. --Shak.

         A good cause would do well, though.      --Dryden.

Source : WordNet®

though
     adv 1: despite the fact that; "even though she knew the answer, she
            did not respond" [syn: {although}, {tho'}]
     2: (postpositive) however; "it might be unpleasant, though"