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Definitions of spontaneous
  1. adjective
    happening or arising without apparent external cause
    "spontaneous laughter" "spontaneous combustion" "a spontaneous abortion"
    Opposite:
  2. adjective
    said or done without having been planned or written in advance
Examples of spontaneous
  • "spontaneous laughter"
  • "spontaneous combustion"
  • "a spontaneous abortion"
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