SPONTANEOUS

• (adj.) happening or arising without apparent external cause

  "spontaneous laughter", "spontaneous combustion", "a spontaneous abortion"

  synonyms : self-generated

• (adj.) said or done without having been planned or written in advance

  "he made a few ad-lib remarks"

  synonyms : ad-lib , unwritten

WordNet® 3.0, © 2006 by Princeton University.

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