- coming or resulting from a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned: a spontaneous burst of applause.
- (of a person) given to acting upon sudden impulses.
- (of natural phenomena) arising from internal forces or causes; independent of external agencies; self-acting.
- growing naturally or without cultivation, as plants and fruits; indigenous.
- produced by natural process.
Origin of spontaneous
SynonymsSee more synonyms for spontaneous on Thesaurus.com
Examples from the Web for spontaneously
The mayor was now spontaneously applauded when he walked down the street.The Resilient City: New York After 9/11
September 11, 2014
In medicine, Lazarus is the patient who, believed dead, spontaneously starts to circulate blood.
In medicine, a ‘Lazarus patient’ is one who spontaneously starts circulating blood.
Devastated, she climbed with feral intensity, hoping the baby might spontaneously abort.Breaking Mount Everest’s Glass Ceiling
Amanda Padoan, Peter Zuckerman
March 30, 2014
Malaysia admitted lithium-ion batteries that have spontaneously exploded on other flights were being carried on the missing plane.Was MH370 Carrying Killer Cargo?
March 21, 2014
Here all the varieties of his studies come into play, as it were, spontaneously.Cleveland Past and Present
I offer the suggestion generously, freely, and spontaneously.Nuts and Nutcrackers
Charles James Lever
What he said came from him spontaneously, without any previous arrangement.The Genius
Margaret Horton Potter
And Desmond was writing again now; fitfully but spontaneously, as of old.Captain Desmond, V.C.
He did spontaneously the things that lesser men do at behest of their press-agents.The Orchard of Tears
- occurring, produced, or performed through natural processes without external influencespontaneous movement
- arising from an unforced personal impulse; voluntary; unpremeditateda spontaneous comment
- (of plants) growing naturally; indigenous
Word Origin and History for spontaneously
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.