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

  

sincerely

 adverb
adverb
BrE BrE//sɪnˈsɪəli//
 
; NAmE NAmE//sɪnˈsɪrli//
 
 
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  • in a way that shows what you really feel or think about somebody/something I sincerely believe that this is the right decision. ‘I won't let you down.’ ‘I sincerely hope not.’
  • Idioms
    Yours sincerely(North American English Sincerely (yours))
     
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     (formal) used at the end of a formal letter before you sign your name, when you have addressed somebody by their name
    See the Oxford Advanced American Dictionary entry: sincerely