Definition of frivolity noun from the Oxford Advanced American Dictionary

 

frivolity

 noun
noun
NAmE//frɪˈvɑlət̮i//
 
(pl. frivolities)(often disapproving)[uncountable, countable]
 
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behavior 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 Learner's Dictionary entry: frivolity