Meaning of “spontaneous” in the English Dictionary

"spontaneous" in British English

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spontaneousadjective

uk /spɒnˈteɪ.ni.əs/ us /spɑːnˈteɪ.ni.əs/
spontaneity
noun [ U ] uk /ˌspɒn.təˈneɪ.ə.ti/ us /ˌspɑːn.tənˈeɪ.ə.t̬i/ approving

The script has a refreshing spontaneity and sparkle.
spontaneously
adverb uk /spɒnˈteɪ.ni.əs.li/ us /spɑːnˈteɪ.ni.əs.li/

The liquid spontaneously ignited.

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

"spontaneous" in American English

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spontaneousadjective

us /spɑnˈteɪ·ni·əs/

happening naturally, without planning or encouragement:

a spontaneous performance
spontaneous affection
spontaneously
adverb us /spɑnˈteɪ·ni·əs·li/

The children spontaneously gave us hugs and kisses.

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