Definition of largely adverb from the Oxford Advanced American Dictionary

  

largely

 adverb
adverb
NAmE//ˈlɑrdʒli//
 
 
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 to a great extent; mostly or mainly the manager, who is largely responsible for the team's victory It was largely a matter of trial and error. He resigned largely because of the stories in the media.
See the Oxford Advanced Learner's Dictionary entry: largely