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Added 9 October 2026

spontaneous

/spɒnˈteɪ.ni.əs/ adjective

In Latin: spontāneus Wiktionary

adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about spontaneous at Wordnik → Where our words come from →

Happening or arising without apparent external cause.
spontaneous laughter
Said or done without having been planned or written in advance.
he made a few ad-lib remarks

Origin

Learned borrowing from Late Latin spontāneus.

From Wiktionary, via Kaikki.org (CC BY-SA)

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