Definition of greatly adverb from the Oxford Advanced American Dictionary

  

greatly

 adverb
adverb
NAmE//ˈɡreɪtli//
 
(formal)
 
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 (usually before a verb or participle) very much People's reaction to the film has varied greatly. a greatly increased risk Your help would be greatly appreciated. The reports were greatly exaggerated.
See the Oxford Advanced Learner's Dictionary entry: greatly