[spon-tuh-nee-i-tee, -ney-]
noun, plural spontaneities.
the state, quality, or fact of being spontaneous.
spontaneous activity.
spontaneities, spontaneous impulses, movements, or actions.

1645–55; < Late Latin spontāne(us) spontaneous + -ity

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World English Dictionary
spontaneity (ˌspɒntəˈniːɪtɪ, -ˈneɪ-)
n , pl -ties
1.  the state or quality of being spontaneous
2.  (often plural) the exhibiting of actions, impulses, or behaviour that are stimulated by internal processes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1650s, from spontaneous. Earliest use is of persons and characters. Spontaneous combustion first attested 1795.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Hence a government drive to inject some gaiety and spontaneity.
Underwater photography always involves an element of spontaneity and ability to
  adapt to changes.
Anyone who has had the good fortune of knowing her cherishes her friendship and
The effect is of wild, luxurious, and decorative spontaneity.
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