spontaneous

[spon-tey-nee-uhs]
adjective
1.
coming or resulting from a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned: a spontaneous burst of applause.
2.
(of a person) given to acting upon sudden impulses.
3.
(of natural phenomena) arising from internal forces or causes; independent of external agencies; self-acting.
4.
growing naturally or without cultivation, as plants and fruits; indigenous.
5.
produced by natural process.

Origin:
1650–60; < Late Latin spontāneus, equivalent to Latin spont(e) willingly + -āneus (-ān(us) -an + -eus -eous)

spontaneously, adverb
spontaneousness, noun
nonspontaneous, adjective
nonspontaneously, adverb
nonspontaneousness, noun
semispontaneous, adjective
semispontaneously, adverb
semispontaneousness, noun
subspontaneous, adjective
subspontaneously, adverb
subspontaneousness, noun
unspontaneous, adjective
unspontaneously, adverb
unspontaneousness, noun


1. unpremeditated, free. See automatic, voluntary.


1. premeditated.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spontaneous (spɒnˈteɪnɪəs)
 
adj
1.  occurring, produced, or performed through natural processes without external influence: spontaneous movement
2.  arising from an unforced personal impulse; voluntary; unpremeditated: a spontaneous comment
3.  (of plants) growing naturally; indigenous
 
[C17: from Late Latin spontāneus, from Latin sponte voluntarily]
 
spon'taneously
 
adv
 
spon'taneousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

spontaneous
1650s, from L.L. spontaneus "willing, of one's free will," from L. (sua) sponte "of one's own accord, willingly;" of unknown origin. Related: Spontaneously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They can bleed spontaneously in their joints during stressful moments.
Adult mammals do not usually spontaneously recover from serious spinal-cord.
The fun thing about the blog is putting up ideas quickly and spontaneously.
The key is a magnet that blows up and spontaneously demagnetizes, releasing
  energy as a pulse of power.
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