- (prep.) A prefix from Eng. prep. in, also from Lat. prep. in, meaning in, into, on, among; as, inbred, inborn, inroad; incline, inject, intrude. In words from the Latin, in- regularly becomes il- before l, ir- before r, and im- before a labial; as, illusion, irruption, imblue, immigrate, impart. In- is sometimes used with an simple intensive force.
- An inseparable prefix or particle, meaning not, non-, un- as, inactive, incapable, inapt. In- regularly becomes il- before l, ir- before r, and im- before a labial.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). in-. Retrieved September 22, 2026, from http://smartdefine.org/in-/definitions/2019960 |
| Chicago | Webster's. 2011. "in-" http://smartdefine.org/in-/definitions/2019960 (accessed September 22, 2026). |
| Harvard | Webster's 2011, in-, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/in-/definitions/2019960>. |
| MLA | Webster's. "in-" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/in-/definitions/2019960> |