Self-generated; happening without any apparent external cause. / Done by one's own free choice, or without planning.

In a spontaneous manner; naturally; voluntarily.

The state or condition of being spontaneous; spontaneity.

(uncountable) The quality of being spontaneous. / (countable) Spontaneous behaviour.

plural of spontaneity

Misspelling of spontaneous.

(politics) The belief that a revolution should arise spontaneously.

Combustion without an external source of heat.

(pathology) A pulmonary condition resulting in the collection of air within the chest, which occurs absent traumatic injury. Spontaneous Pneumothorax are considered a medical emergency, generally requiring assistive radiographic evaluation to determine the extent of lung collapse, as well as determine the most appropriate course of emergency medical treatment for the patient. Abbreviated as SP.

plural of spontaneous combustion