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Done by one's own free choice, or without planning.
From Late Latin spontāneus of one's own accord from Latin sponte (s)pen- in Indo-European roots
American Heritage Dictionary of the English Language, 5th Edition
Late Latin spontaneus, from Latin sponte (sua) (“of one's free will, voluntarily").
Sometimes spontaneous events worked out better than well-planned ones.
Helen is a wonderful child, so spontaneous and eager to learn.
Almost all day long the house resounded with their running feet, their cries, and their spontaneous laughter.
And Nicholas heard her spontaneous, happy, ringing laughter.
Others are deprived of a part of their more volatile constituents by spontaneous evaporation, or by distillation, in vacuo or otherwise, at the lowest possible temperature.
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