spontaneous

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spontaneous

(of plants) growing naturally; indigenous

spontaneous

[spän′tā·nē·əs]
(physics)
Occurring without application of an external agency, because of the inherent properties of an object.
References in periodicals archive ?
Evidence for the spontaneousness of trait inferences.
While Jean-Claude de Crousaz's manner is sometimes inspired by Japanese aesthetics--with its marked predilection for asymmetry, gestural spontaneousness or the use of a subdued polychromy imposed by the ceramic medium--it is only to better serve a decorative vocabulary which is entirely his own.
This noisy reception was not organized in advance, in fact, according to one report, the "impressive feature of her welcome home was its spontaneousness.