Definition of twice adverb from the Oxford Advanced Learner's Dictionary

      

    twice

     adverb
    adverb
    BrE BrE//twaɪs//
     
    ; NAmE NAmE//twaɪs//
     
     
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  1. 1  two 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 Wales Cats sleep twice as much as people. At 56 he's twice her age. Charges have risen at twice the rate of inflation.
  3. Word Origin late Old English twiges, from the base of two + -s (later respelled -ce to denote the unvoiced sound); compare with once.Idioms
    lightning never strikes (in the same place) twice
     
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    (saying) an unusual or unpleasant event is not likely to happen in the same place or to the same people twice
    (saying) after an unpleasant experience you are careful to avoid something similar  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 There was enough of the drug in her stomach to kill her twice over.
See the Oxford Advanced American Dictionary entry: twice