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

 

frivolity

 noun
noun
BrE BrE//frɪˈvɒləti//
 
; NAmE NAmE//frɪˈvɑːləti//
 
(pl. frivolities)(often disapproving)[uncountable, countable]
 
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behaviour that is silly or amusing, especially when this is not suitable It was just a piece of harmless frivolity. A wave of frivolity has overtaken the election campaign. I can't waste time on such frivolities.
See the Oxford Advanced American Dictionary entry: frivolity