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

 

cumulatively

 adverb
adverb
BrE BrE//ˈkjuːmjələtɪvli//
 
; NAmE NAmE//ˈkjuːmjəleɪtɪvli//
 
 
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in a way that increases in strength or importance each time something more or new is added Cumulatively, these archaeological discoveries give a very clear picture of Celtic life.