- In its natural position or place; -- said of a rock or fossil, when found in the situation in which it was originally formed or deposited.
- In its natural or original position or place; in position; -- said specifically, in geology, of a rock, soil or fossil, when in the situation in which it was originally formed or deposited.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). in situ. Retrieved September 26, 2026, from http://smartdefine.org/in_situ/definitions/2019957 |
| Chicago | Webster's. 2011. "in situ" http://smartdefine.org/in_situ/definitions/2019957 (accessed September 26, 2026). |
| Harvard | Webster's 2011, in situ, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/in_situ/definitions/2019957>. |
| MLA | Webster's. "in situ" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/in_situ/definitions/2019957> |