Definition of unimportance noun from the Oxford Advanced Learner's Dictionary

 

unimportance

 noun
noun
BrE BrE//ˌʌnɪmˈpɔːtns//
 
; NAmE NAmE//ˌʌnɪmˈpɔːrtns//
 
[uncountable]
 
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the fact of not being important the relative unimportance of labour-intensive manufacturing industries in the new economy opposite importance