Definition of though conjunction from the Oxford Advanced Learner's Dictionary

      

    though

     conjunction
    conjunction
    BrE BrE//ðəʊ//
     
    ; NAmE NAmE//ðoʊ//
     
     
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  1. 1  despite the fact that synonym although Anne was fond of Tim, though he often annoyed her. Though she gave no sign, I was sure she had seen me. His clothes, though old and worn, looked clean and of good quality. Strange though it may sound, I was pleased it was over.
  2. 2  used to add a fact or an opinion that makes the previous statement less strong or less important They're very different, though they did seem to get on well when they met. He'll probably say no, though it's worth asking. Which Word?although / even though / though You can use these words to show contrast between two clauses or two sentences. Though is used more in spoken than in written English. You can use although, even though and though at the beginning of a sentence or clause that has a verb. Notice where the commas go:Although/​Even though/​Though everyone played well, we lost the game. We lost the game, although/​even though/​though everyone played well. You cannot use even on its own at the beginning of a sentence or clause instead of although, even though or though:Even everyone played well, we lost the game.
  3. Word Origin Old English thēah, of Germanic origin; related to Dutch and German doch; superseded in Middle English by forms from Old Norse thó, thau.Idioms  in a way that suggests something He behaved as if nothing had happened. It sounds as though you had a good time. It's my birthday. As if you didn't know! ‘Don't say anything.’ ‘As if I would!(= surely you do not expect me to)  despite the fact or belief that; no matter whether I'll get there, even if I have to walk. I like her, even though she can be annoying at times.
See the Oxford Advanced American Dictionary entry: though