noun
- A form of life assumed to exist outside the Earth or its atmosphere.
- synonyms: extraterrestrial being, alien
adjective
- Originating or located or occurring outside Earth or its atmosphere.
- usage: "is there extraterrestrial life"
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). extraterrestrial. Retrieved September 25, 2026, from http://smartdefine.org/extraterrestrial/definitions/1173796 |
| Chicago | WordNet. 2010. "extraterrestrial" http://smartdefine.org/extraterrestrial/definitions/1173796 (accessed September 25, 2026). |
| Harvard | WordNet 2010, extraterrestrial, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/extraterrestrial/definitions/1173796>. |
| MLA | WordNet. "extraterrestrial" 23 October 2010. Web. 25 September 2026. <http://smartdefine.org/extraterrestrial/definitions/1173796> |