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"

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "though":
   admitting that, after all, again, albeit, all the same,
   allowing that, although, at all events, at any rate, but, even,
   even so, for all that, granted, howbeit, however, in any case,
   in any event, just the same, nevertheless, nonetheless,
   notwithstanding, rather, still, supposing, when, while, yet