Definition of twice adverb from the Oxford Advanced American Dictionary

      

    twice

     adverb
    adverb
    NAmE//twaɪs//
     
     
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  1. 1two times; on two occasions I don't know him well; I've only met him twice. They go there twice a week/month/year. a twice-monthly/yearly newsletter
  2. 2 double in quantity, rate, etc. an area twice the size of New Jersey Cats sleep twice as much as people. At 56 he's twice her age. Charges have risen at twice the rate of inflation.
  3. Idioms
    lightning never strikes (in the same place) twice(saying)
     
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    an unusual or unpleasant event is not likely to happen in the same place or to the same people twice
    once or twice
     
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    a few times I don't know her well, I've only met her once or twice.
    think twice about something/about doing something
     
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    to think carefully before deciding to do something You should think twice about employing someone you've never met.
    not just once but twice By one estimate, he's a billionaire at least twice over.
See the Oxford Advanced Learner's Dictionary entry: twice