Spontaneous Definition

spŏn-tānē-əs
adjective
Having no apparent external cause or influence; occurring or produced by its own energy, force, etc. or through internal causes; self-acting.
Webster's New World
Acting in accordance with or resulting from a natural feeling, impulse, or tendency, without any constraint, effort, or premeditation.
Webster's New World
Unconstrained and unstudied in manner or behavior.
A spontaneous personality.
American Heritage
Growing naturally without being planted or tended; indigenous; wild.
Webster's New World

Done by one's own free choice, or without planning.

Wiktionary

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

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