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spontaneous
used in The Lightning Thief

only 1 use
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Definition
happening or arising without plan (naturally)

or:

behaving in an instinctive, uninhibited manner (unplanned)

or:

happening without apparent external cause
  • "Spontaneous combustion is a form of harm, Mr. D," Chiron put in.
    Chapter 9 (26% in)
spontaneous = happening without apparent external cause

(editor's note:  Spontaneous combustion refers to something bursting into flame without apparent cause.)
There are no more uses of "spontaneous" in The Lightning Thief.

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