Spontaneous

spon-tā′nē-us, adj. of one's free-will: involuntary: acting by its own impulse or natural law: produced of itself or without interference.— ns. Spontanē′ity , Spontā′neousne , the state or quality of being spontaneous.— adv. Spontā′neously .— Spontaneous combustion , a phenomenon that occasionally manifests itself in mineral and organic substances; Spontaneous generation , a term applied to the real or imaginary development of lowly organisms from non-living matter. [L. spontaneus — sponte , of one's own accord.]