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Definition: 1 proceeding from innate tendency, natural feeling or sudden impulse innate tendency without external constraint a spontaneous expression of gratitude . 2 by nature unconstrained or uninhibited. 3 springing from a sudden impulse a spontaneous offer of help . 4 controlled and directed internally. 5 developing without apparent external influence or, force, cause, or treatment spontaneous recovery . 6 archaic said of plants: indigenous; natural
Source: The Penguin English Dictionary. London: Penguin, 2007. Credo Reference. Web. 14 August 2012.