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

      

    perfectly

     adverb
    adverb
    BrE BrE//ˈpɜːfɪktli//
     
    ; NAmE NAmE//ˈpɜːrfɪktli//
     
     
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  1. 1  completely It's perfectly normal to feel like this. It's perfectly good as it is (= it doesn't need changing). You know perfectly well what I mean. To be perfectly honest, I didn't want to go anyway. He stood perfectly still until the danger had passed. ‘Do you understand?’ ‘Perfectly.’ (old-fashioned) How perfectly awful! They’re perfectly within their rights to ask to see the report.
  2. 2  in a perfect way The TV works perfectly now. It fits perfectly.
  3. Extra examples It’s perfectly OK as it is. It’s perfectly normal to feel like this. The dress fitted perfectly. The kids behaved perfectly throughout the evening. To be perfectly honest I don’t like the colour. We had to stand perfectly still. You know perfectly well I can’t help you.
See the Oxford Advanced American Dictionary entry: perfectly