Simple Definition of spontaneous
: done or said in a natural and often sudden way and without a lot of thought or planning
: doing things that have not been planned but that seem enjoyable and worth doing at a particular time
Full Definition of spontaneous
2 : arising from a momentary impulse
3 : controlled and directed internally : self-acting <spontaneous movement characteristic of living things>
4 : produced without being planted or without human labor : indigenous
5 : developing or occurring without apparent external influence, force, cause, or treatment
Examples of spontaneous
Shane has a lovely habit of paying us spontaneous visits: one time she brought over a jar of a pickle she'd recently put up; another time just a good story or two. —James Oseland, Saveur, December 2006
Cold viruses can damage the olfactory system directly. This loss of smell may last even after the cold is over. Sometimes the sense comes back as suddenly as it disappeared, perhaps because even as adults we generate new olfactory neurons. Spontaneous improvement might be a person's best hope, because there are no real proven treatments for reversing olfactory nerve damage. —Harvard Health Letter, September 2001
Peter Jakobsen of the European Space Agency, which built the Faint Object Camera, drew spontaneous applause at the January meeting when he showed an image of supernova SN1987A from the instrument. —Kristin Leutwyler, Scientific American, March 1994
The comment was completely spontaneous.
He's a guy who's spontaneous and fun.
Origin of spontaneous
Late Latin spontaneus, from Latin sponte of one's free will, voluntarily
First Known Use: 1653
Synonym Discussion of spontaneous
Medical Definition of spontaneous
1: proceeding from natural feeling or native tendency without external constraint
2: developing without apparent external influence, force, cause, or treatment <a spontaneous nosebleed>
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