noun
- Fluctuations that occur during each day. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). diurnal variation. Retrieved September 25, 2026, from http://smartdefine.org/diurnal_variation/definitions/1219904 |
| Chicago | WordNet. 2010. "diurnal variation" http://smartdefine.org/diurnal_variation/definitions/1219904 (accessed September 25, 2026). |
| Harvard | WordNet 2010, diurnal variation, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/diurnal_variation/definitions/1219904>. |
| MLA | WordNet. "diurnal variation" 23 October 2010. Web. 25 September 2026. <http://smartdefine.org/diurnal_variation/definitions/1219904> |