- (n.) The assemblage of two or more crystals or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about.
- (p.pr.&vb.n.) of Twin.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). twinning. Retrieved September 24, 2026, from http://smartdefine.org/twinning/definitions/2075816 |
| Chicago | Webster's. 2011. "twinning" http://smartdefine.org/twinning/definitions/2075816 (accessed September 24, 2026). |
| Harvard | Webster's 2011, twinning, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/twinning/definitions/2075816>. |
| MLA | Webster's. "twinning" 28 May 2011. Web. 24 September 2026. <http://smartdefine.org/twinning/definitions/2075816> |