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

    

considerably

 adverb
adverb
BrE BrE//kənˈsɪdərəbli//
 
; NAmE NAmE//kənˈsɪdərəbli//
 
(formal)
 
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much; a lot synonym significantly 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 American Dictionary entry: considerably