Spontaneous
a.-
Proceeding from natural feeling, temperament, or disposition, or from a native internal proneness, readiness, or tendency, without constraint;
as, a .spontaneous gift or proposition -
Proceeding from, or acting by, internal impulse, energy, or natural law, without external force;
as, spontaneous motion;spontaneous growth. -
Produced without being planted, or without human labor;
as, a .spontaneous growth of wood
Spontaneous combustion ,
combustion produced in a substance by the evolution of heat through the chemical action of its own elements; as, the spontaneous combustion of waste matter saturated with oil.
Spontaneous generation . (Biol.)
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