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spontaneous

spon·ta·ne·ous [ spon táynee əss ]


adjective 
Definition:
 
1. arising from internal cause: resulting from internal or natural processes, with no apparent external influence

2. arising from impulse: arising from natural impulse or inclination, rather than from planning or in response to suggestions from others

3. unrestrained: naturally unrestrained or uninhibited

4. botany growing uncultivated: growing without cultivation

[Mid-17th century. < late Latin spontaneus "of your own accord" < Latin sponte in same sense]

spon·ta·ne·ous·ly adverb
spon·ta·ne·ous·ness noun
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