What does the word spontaneity mean?

Usage examples for spontaneity

  1. A current of bold spontaneity has passed through here. – The French Impressionists (1860-1900) by Camille Mauclair
  2. Guests came to the house, and Bert addressed his wife with some faint spontaneity, and Nancy eagerly answered him. – Undertow by Kathleen Norris
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