All 4 Uses

spontaneous
in
Self-Reliance, by Emerson
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They teach us to abide by our spontaneous impression with good-humored inflexibility then most when[153] the whole cry of voices is on the other side.†
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spontaneous = behaving in an instinctive, uninhibited manner OR happening naturally (without planning or external force)
Do I not know beforehand that not possibly can he say a new and spontaneous word?†
The muscles, not spontaneously moved, but moved by a low usurping willfulness, grow tight about the outline of the face with the most disagreeable sensation.†

spontaneously = happening in a natural manner without planning or external force
The inquiry leads us to that source, at once the essence of genius, of virtue, and of life, which we call Spontaneity or Instinct.†

spontaneity = behavior or action that happens naturally without planning or external force

Definitions:

(1) (spontaneous)
happening naturally, suddenly, or without outside planning or action
(2) (meaning too rare to warrant focus)