spontaneous

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spontaneous

(of plants) growing naturally; indigenous
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

spontaneous

[spän′tā·nē·əs]
(physics)
Occurring without application of an external agency, because of the inherent properties of an object.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.