Spontaneous definition

spŏn-tānē-əs
Having no apparent external cause or influence; occurring or produced by its own energy, force, etc. or through internal causes; self-acting.
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Growing naturally without being planted or tended; indigenous; wild.
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Acting in accordance with or resulting from a natural feeling, impulse, or tendency, without any constraint, effort, or premeditation.
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3
Growing without cultivation or human labor.

Spontaneous vegetation.

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2
Controlled and directed internally : self-active : spontaneous movement characteristic of living things.
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Sudden, without warning.
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The definition of spontaneous is unplanned or done on impulse.

An example of spontaneous is waking up and deciding to take a trip across the country that day.

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Done by one's own free choice, or without planning.
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Random.
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Self generated; happening without any apparent external cause.

He made a spontaneous offer of help.

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Proceeding from natural feeling or native tendency without external constraint.
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Arising from a momentary impulse.
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Produced without being planted or without human labor : indigenous.
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Not apparently contrived or manipulated : natural.
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Unconstrained and unstudied in manner or behavior.

A spontaneous personality.

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Happening or arising without apparent external cause; self-generated.

A microorganism capable of spontaneous movement.

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Arising from a natural inclination or impulse and not from forethought or prompting.

Spontaneous laughter; a spontaneous protest.

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Origin of spontaneous

  • From Late Latin spontāneus of one's own accord from Latin sponte (s)pen- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Late Latin spontaneus, from Latin sponte (sua) (“of one's free will, voluntarily").

    From Wiktionary