The Collaborative International Dictionary of English v.0.48:

Though \Though\, adv.
   However; nevertheless; notwithstanding; -- used in familiar
   language, and in the middle or at the end of a sentence.
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         I would not be as sick though for his place. --Shak.
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         A good cause would do well, though.      --Dryden.
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The Collaborative International Dictionary of English v.0.48:

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.
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         Though he slay me, yet will I trust in him. --Job xiii.
                                                  15.
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         Not that I so affirm, though so it seem. --Milton.
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   Note: It is compounded with all in although. See Although.
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   As though, as if.
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            In the vine were three branches; and it was as
            though it budded.                     --Gen. xl. 10.
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WordNet (r) 3.0 (2006):

though
    adv 1: (postpositive) however; "it might be unpleasant, though"