- 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 on Thesaurus.com
Examples from the Web for subspontaneous
Authors who have seen the species in the East do not hesitate to say that it is subspontaneous.
Many floras of the south of Europe speak of it as a subspontaneous or naturalized species.
Usually they indicate the carob tree, as cultivated and subspontaneous, or nearly wild.
- (of a plant species, such as rhododendron) spreading naturally after having originally been introduced
- 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 subspontaneous
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.