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

 

assiduously

 adverb
adverb
BrE BrE//əˈsɪdjuəsli//
 
; NAmE NAmE//əˈsɪdʒuəsli//
 
(formal)
 
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in a way that involves working very hard and taking great care He worked assiduously to earn the money for his son’s education.