- acting in accordance with or resulting from a natural feeling, impulse, or tendency, without any constraint, effort, or premeditation
- having no apparent external cause or influence; occurring or produced by its own energy, force, etc. or through internal causes; self-acting
- growing naturally without being planted or tended; indigenous; wild
Origin of spontaneous
Late Latin spontaneus from Classical Latin sponte, of free will from Indo-European base an unverified form (s)pen(d)-, to pull from source spin
