Definition of considerably adverb from the Oxford Advanced American Dictionary

        

    considerably

     adverb
    adverb
    NAmE//kənˈsɪdərəbli//
     
    (formal)
     
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  1. 1  much; a lot synonym significantly
  2. 2 The need for sleep varies considerably from person to person. Interest rates on bank loans have increased considerably in recent years.
See the Oxford Advanced Learner's Dictionary entry: considerably