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

      

    faithfully

     adverb
    adverb
    BrE BrE//ˈfeɪθfəli//
     
    ; NAmE NAmE//ˈfeɪθfəli//
     
     
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  1. 1  accurately; carefully to follow instructions faithfully The events were faithfully recorded in her diary.
  2. 2  in a loyal way; in a way that you can rely on He had supported the local team faithfully for 30 years. She promised faithfully not to tell anyone my secret.
  3. Idioms  (British English) used at the end of a formal letter before you sign your name, when you have addressed somebody as ‘Dear Sir/Dear Madam, etc.’ and not by their name
See the Oxford Advanced American Dictionary entry: faithfully