Spontaneity (noun)

1. The quality or condition of being spontaneous; naturalness.
2. The state or quality of being done or occurring without premeditation; impulsiveness.

Origin:

From latin spontaneus, from sponte ("of one"s own accor.d")

Examples:

1. She admired the spontaneity of the actor's performance.
2. He had always been known for his spontaneity and sense of humor.
3. The children's spontaneity and creativity was a joy to watch.
4. The dancer's spontaneity was evident in her fluid movements.
5. The spontaneity of the conversation made it enjoyable for everyone.