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spontaneous

[spon-tey-nee-uh s] /spɒnˈteɪ ni əs/
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
1650-1660
1650-60; < Late Latin spontāneus, equivalent to Latin spont(e) willingly + -āneus (-ān(us) -an + -eus -eous)
Related forms
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
Synonyms
1. unpremeditated, free. See automatic, voluntary.
Antonyms
1. premeditated.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for spontaneously
  • 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.
  • Fresh ideas often emerge spontaneously in off hours.
  • In contrast with previous anti-globalisation protests, many of the latest ones seem to have started spontaneously.
  • Warmed by the sun, thousands of monarch butterflies spontaneously take flight.
  • And cricket fans in both countries link up spontaneously.
  • Some of these peaks have been known to spew gas plumes that spontaneously combust, sending tongues of fire high into the sky.
  • In scramjets, oxygen is rammed into a combustion chamber where it mixes with fuel and spontaneously ignites.
British Dictionary definitions for spontaneously

spontaneous

/spɒnˈteɪnɪəs/
adjective
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
Derived Forms
spontaneously, adverb
spontaneousness, noun
Word Origin
C17: from Late Latin spontāneus, from Latin sponte voluntarily
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for spontaneously

spontaneous

adj.

1650s, from Late Latin spontaneus "willing, of one's free will," from Latin (sua) sponte "of one's own accord, willingly;" of unknown origin. Related: Spontaneously. Earliest use is of persons and characters. Spontaneous combustion first attested 1795. Spontaneous generation (the phrase, not the event) attested from 1650s.

Online Etymology Dictionary, © 2010 Douglas Harper
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