Definition of serene adjective from the Oxford Advanced American Dictionary

 

serene

 adjective
adjective
NAmE//səˈrin//
 
 
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calm and peaceful a lake, still and serene in the sunlight
 
adverb serenely beautiful She smiled serenely.
NAmE//səˈrɛnət̮i//
 
noun [uncountable, singular] The hotel offers a haven of peace and serenity away from the bustle of the city.
See the Oxford Advanced Learner's Dictionary entry: serene