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The Collaborative International Dictionary of English v.0.48 (gcide)

Spontaneity \Spon`ta*ne"i*ty\ (sp[o^]n`t[.a]*n[=e]"[i^]*t[y^]),
n.; pl. {Spontaneities} (-t[i^]z). [Cf. F.
spontan['e]it['e].]
1. The quality or state of being spontaneous, or acting from
native feeling, proneness, or temperament, without
constraint or external force.
[1913 Webster]

Romney Leigh, who lives by diagrams,
And crosses not the spontaneities
Of all his individual, personal life
With formal universals. --Mrs.
Browning.
[1913 Webster]

2. (Biol.)
(a) The tendency to undergo change, characteristic of both
animal and vegetable organisms, and not restrained or
checked by the environment.
(b) The tendency to activity of muscular tissue, including
the voluntary muscles, when in a state of healthful
vigor and refreshment.
[1913 Webster]