noun
- The outer region of the Earth's atmosphere; contains a high concentration of free electrons. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). ionosphere. Retrieved September 21, 2026, from http://smartdefine.org/ionosphere/definitions/1224305 |
| Chicago | WordNet. 2010. "ionosphere" http://smartdefine.org/ionosphere/definitions/1224305 (accessed September 21, 2026). |
| Harvard | WordNet 2010, ionosphere, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/ionosphere/definitions/1224305>. |
| MLA | WordNet. "ionosphere" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/ionosphere/definitions/1224305> |