- (a.) Proceding from natural feeling, temperament or disposition or from a native internal proneness, readiness or tendency, without constraint; as, a spontaneous gift or proportion.
- (a.) Proceeding from or acting by, internal impulse, energy or natural law, without external force; as, spontaneous motion; spontaneous growth.
- (a.) Produced without being planted or without human labor; as, a spontaneous growth of wood.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). spontaneous. Retrieved September 20, 2026, from http://smartdefine.org/spontaneous/definitions/2065237 |
| Chicago | Webster's. 2011. "spontaneous" http://smartdefine.org/spontaneous/definitions/2065237 (accessed September 20, 2026). |
| Harvard | Webster's 2011, spontaneous, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/spontaneous/definitions/2065237>. |
| MLA | Webster's. "spontaneous" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/spontaneous/definitions/2065237> |