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English definition of “spontaneous”

spontaneous

adjective     /spɒnˈteɪ.ni.əs/ US  /spɑːn-/
happening or done in a natural , often sudden way, without any planning or without being forced : His jokes seemed spontaneous, but were in fact carefully prepared beforehand .approving She's such a spontaneous, lively woman.Not expected or planned spontaneity     /ˌspɒn.təˈneɪ.ɪ.ti/ US  /ˌspɑːn.t̬əˈneɪ.ə.t̬i/ noun [U] approving The script has a refreshing spontaneity and sparkle .Not expected or planned spontaneously     /-li/ adverb The liquid spontaneously ignited .Not expected or planned
(Definition of spontaneous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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