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1. Happening or arising without apparent external cause; self-generated: a microorganism capable of spontaneous movement.
2. Arising from a natural inclination or impulse and not from forethought or prompting: spontaneous laughter; a spontaneous protest.
3. Unconstrained and unstudied in manner or behavior: a spontaneous personality.
4. Growing without cultivation or human labor: spontaneous vegetation.

[From Late Latin spontāneus, of one's own accord, from Latin sponte; see (s)pen- in Indo-European roots.]

spon·ta′ne·ous·ly adv.
spon·ta′ne·ous·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.spontaneousness - the quality of being spontaneous and coming from natural feelings without constraint; "the spontaneity of his laughter"
naturalness - the quality of being natural or based on natural principles; "he accepted the naturalness of death"; "the spontaneous naturalness of his manner"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
تِلقائِيَّه، عَفْوِيَّه
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(spənˈteiniəs) adjective
1. said, done etc of one's own free will without pressure from others. His offer was quite spontaneous.
2. natural; not forced. spontaneous behaviour.
sponˈtaneously adverb
sponˈtaneousness noun
spontaneity (spontəˈneiəti) , (spontəˈniːəti) noun
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
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References in periodicals archive ?
supported and enacted ideologies of leaderlessness and spontaneousness.
The visual spontaneousness and transparency of the watercolor medium plays an important role to the aesthetics of each painting.