Definition of "spontaneous" []

• Happening or arising without apparent external cause; self-generated. (adjective)
• Arising from a natural inclination or impulse and not from external incitement or constraint. (adjective)
• Unconstrained and unstudied in manner or behavior. (adjective)
• Growing without cultivation or human labor. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Thus, the term spontaneous order may be used to refer strictly to voluntary orders — that is, forms of social coordination which emerge from the free actions of many different people, as opposed to coordination that arises from some people being forced to do what other people tell them to do."
• "Darwin, I beliieve used the term spontaneous variations."
• "The term spontaneous abortion is defined in the “Management of Spontaneous Abortion” by Dr. Greibel, Dr Halvorsen, Dr Golemon, and Dr. Day."