- (n.) Backward development; a passing from a higher to a lower state of organization or structure, as when an animal, approaching maturity, becomes less highly organized than would be expected from its earlier stages or known relationship. Called also retrograde development, and regressive metamorphism.
- (n.) The act of retrograding or going backward; retrogradation.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). retrogression. Retrieved September 22, 2026, from http://smartdefine.org/retrogression/definitions/2055416 |
| Chicago | Webster's. 2011. "retrogression" http://smartdefine.org/retrogression/definitions/2055416 (accessed September 22, 2026). |
| Harvard | Webster's 2011, retrogression, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/retrogression/definitions/2055416>. |
| MLA | Webster's. "retrogression" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/retrogression/definitions/2055416> |