Spontaneity

n.	1.	The quality or state of being spontaneous, or acting from native feeling, proneness, or temperament, without constraint or external force. Romney Leigh, who lives by diagrams, And crosses not the spontaneities Of all his individual, personal life With formal universals. - Mrs. Browning.
	2.	(Biol.) The tendency to undergo change, characteristic of both animal and vegetable organisms, and not restrained or checked by the environment.

Noun

1.

spontaneity - the quality of being spontaneous and coming from natural feelings without constraint; "the spontaneity of his laughter" Synonyms: spontaneousness

abandon, autonomousness, autonomy, ease, extemporaneousness, free will, gratuitousness, indeliberation, independence, involuntariness, naturalness, offhandedness, self-action, self-activity, self-determination, snap decision, snap judgment, snapshot, spontaneousness, uncalculatedness, undeliberateness, unforcedness, unpremeditation, unrestraint, voluntariness, voluntarism, voluntaryism, volunteer, volunteering