Definition of gradually adverb from the Oxford Advanced American Dictionary

  

gradually

 adverb
adverb
NAmE//ˈɡrædʒuəli//
 
, NAmE//ˈɡrædʒəli//
 
 
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 slowly, over a long period of time The weather gradually improved. Gradually, the children began to understand. Women have gradually become more involved in the decision-making process.
See the Oxford Advanced Learner's Dictionary entry: gradually