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From The Collaborative International Dictionary of English v.0.48:
Spontaneous \Spon*ta"ne*ous\ (sp[o^]n*t[=a]"n[-e]*[u^]s), a. [L. spontaneus, fr. sponte of free will, voluntarily.] 1. Proceeding from natural feeling, temperament, or disposition, or from a native internal proneness, readiness, or tendency, without constraint; as, a spontaneous gift or proposition. [1913 Webster] 2. Proceeding from, or acting by, internal impulse, energy, or natural law, without external force; as, spontaneous motion; spontaneous growth. [1913 Webster] 3. Produced without being planted, or without human labor; as, a spontaneous growth of wood. [1913 Webster] 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.) See under Generation. [1913 Webster] Syn: Voluntary; uncompelled; willing. Usage: Spontaneous, Voluntary. What is voluntary is the result of a volition, or act of choice; it therefore implies some degree of consideration, and may be the result of mere reason without excited feeling. What is spontaneous springs wholly from feeling, or a sudden impulse which admits of no reflection; as, a spontaneous burst of applause. Hence, the term is also applied to things inanimate when they are produced without the determinate purpose or care of man. "Abstinence which is but voluntary fasting, and . . . exercise which is but voluntary labor." --J. Seed. [1913 Webster] Spontaneous joys, where nature has its play, The soul adopts, and owns their firstborn away. --Goldsmith. [1913 Webster] -- Spon*ta"ne*ous*ly, adv. -- Spon*ta"ne*ous*ness, n. [1913 Webster]