- (a.) Added extrinsically; not essentially inherent; accidental or causal; additional; supervenient; foreign.
- (a.) Accidentally or sparingly spontaneous in a country or district; not fully naturalized; adventive; -- applied to foreign plants.
- (a.) Acquired, as diseases; accidental.
- (a.) Out of the proper or usual place; as, adventitious buds or roots.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). adventitious. Retrieved September 23, 2026, from http://smartdefine.org/adventitious/definitions/1971226 |
| Chicago | Webster's. 2011. "adventitious" http://smartdefine.org/adventitious/definitions/1971226 (accessed September 23, 2026). |
| Harvard | Webster's 2011, adventitious, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/adventitious/definitions/1971226>. |
| MLA | Webster's. "adventitious" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/adventitious/definitions/1971226> |