Meaning of “spontaneous” in the English Dictionary

"spontaneous" in English

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

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

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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us /spɑnˈteɪ·ni·əs/

happening naturally, without planning or encouragement:

a spontaneous performance
spontaneous affection
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)

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I believe that regulating among other things spontaneous but peaceful demonstrations about which the authorities have not been given prior notification is both highly timely and necessary.
We never imagined that our spontaneous group, motivated by pain and injustice, which has no political allegiance or party or group organisation, would receive such a prestigious tribute.
An effort will also be made to ensure that hearings are livelier, more spontaneous and less rigid than in the past.
We saw earlier that a slightly more spontaneous organisation gave rise to much more lively debate than when the debates are organised by the heads and leaders of the groups.
Is this hysteria spontaneous?
Since the spontaneous discipline of the market upon the national administrations is gradually disappearing, it must be replaced by establishing a central administrative authority which will hand out orders.
The spontaneous response of the people, especially when disaster and suffering strike, is the ultimate expression of sincerity and faith in coexistence and solidarity between nations.
We request that these cease without delay and that the government and the rebel forces stop exploiting demonstrations which, in reality, are not at all spontaneous.