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happening naturally and suddenly and without being planned: a spontaneous reaction. The crowd broke into spontaneous applause. spontaneity. noun [ U ] uk / ˌspɒntəˈneɪəti / us. the quality of being spontaneous: The performance was boring and lacked spontaneity. spontaneously. adverb.
Spontaneous definition: coming or resulting from a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned. See examples of SPONTANEOUS used in a sentence.
1. coming or resulting from a natural impulse or tendency; without effort or premeditation. 2. (of a person) given to acting upon sudden impulses. 3. (of natural phenomena) arising from internal forces or causes. 4. growing naturally or without cultivation, as plants and fruits; indigenous.