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English definition of “spontaneous”

spontaneous

adjective     /spɒnˈteɪniəs/
happening naturally and suddenly and without being planned: a spontaneous reaction The crowd broke into spontaneous applause.Not expected or planned
spontaneity     /ˌspɒntəˈneɪəti/ noun [U] the quality of being spontaneous: The performance was boring and lacked spontaneity.Not expected or planned spontaneously adverb
(Definition of spontaneous adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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