Merriam-Webster's Collegiate® Dictionary, 11th Edition
THOUGH
I. conjunction
Etymology: Middle English, adverb & conjunction, of Scandinavian origin; akin to Old Norse thō nevertheless; akin to Old English thēah nevertheless, Old High German doh Date: before 12th century in spite of the fact that ; while , in spite of the possibility that ; even if ,
II. adverb
Date: 13th century
however , nevertheless