Pronunciation: (spon-tā'nē-us), [key]
1. coming or resulting from a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned: a spontaneous burst of applause.
2. (of a person) given to acting upon sudden impulses.
3. (of natural phenomena) arising from internal forces or causes; independent of external agencies; self-acting.
4. growing naturally or without cultivation, as plants and fruits; indigenous.
5. produced by natural process.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

spontaneityspontaneous abortion
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