All 5 Uses

spontaneous
in
Killing Lincoln
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As Lee rides back to his lines, the Army of Northern Virginia spontaneously gathers on both sides of the road.†
p. 83.3 *

spontaneously = happening in a natural manner without planning or external force
Lincoln clearly sees the faces of the crowd, with their spontaneous smiles and unabashed joy, and prepares to deliver a speech that is anything but warmhearted.†
p. 108.3

spontaneous = behaving in an instinctive, uninhibited manner OR happening naturally (without planning or external force)
Grant says nothing, but the combination of a small wave to the crowd and Stan-ton's spontaneous words are enough to satiate Grant's fans.†
p. 138.8
With officials looking everywhere for the killers, on streets filled with bonfires and spontaneous parades and hordes of drunken revelers, blending in to the bedlam should be as simple as staying calm.†
p. 189.1
At the same instant, yet another spontaneous torchlight parade blocks Booth's getaway on Tenth Street.†
p. 211.1

Definitions:

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