Definition of virtually adverb from the Oxford Advanced American Dictionary

        

    virtually

     adverb
    adverb
    NAmE//ˈvərtʃuəli//
     
    , NAmE//ˈvərtʃəli//
     
     
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  1. 1almost or very nearly, so that any slight difference is not important to be virtually impossible Virtually all students will be exempt from the tax. He virtually admitted he was guilty. This year's results are virtually the same as last year's. The red squirrel has become virtually extinct in most of the country.
  2. 2(computing) by the use of computer software that makes something appear to exist; using virtual reality technology
See the Oxford Advanced Learner's Dictionary entry: virtually