Meaning of “serene” in the English Dictionary

"serene" in British English

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sereneadjective

uk /səˈriːn/ us /səˈriːn/
serenely
adverb uk /səˈriːn.li/ us /səˈriːn.li/

She smiled serenely and said nothing.
serenity
noun [ U ] uk /səˈren.ə.ti/ us /səˈren.ə.t̬i/

C2

I admired her serenity in the midst of so much chaos.

(Definition of “serene” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"serene" in American English

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sereneadjective

us /səˈrin/

peaceful and calm, or (of a person) not worried or excited:

He approached the job with the serene confidence that he could succeed where others had failed.
serenity
noun [ U ] us /səˈren·ɪ·t̬i/

He wrote of the beauty and serenity of the great river.

(Definition of “serene” from the Cambridge Academic Content Dictionary © Cambridge University Press)