noun
- Cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force. (.
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). dark matter. Retrieved September 22, 2026, from http://smartdefine.org/dark_matter/definitions/1247409 |
| Chicago | WordNet. 2010. "dark matter" http://smartdefine.org/dark_matter/definitions/1247409 (accessed September 22, 2026). |
| Harvard | WordNet 2010, dark matter, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/dark_matter/definitions/1247409>. |
| MLA | WordNet. "dark matter" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/dark_matter/definitions/1247409> |