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

 

reasonableness

 noun
noun
BrE BrE//ˈriːznəblnəs//
 
; NAmE NAmE//ˈriːznəblnəs//
 
[uncountable]
 
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the fact of being fair, practical and sensible The court must determine the reasonableness of the costs claimed. She spoke with an air of sweet reasonableness. opposite unreasonableness