adjective
- Coming next after the third and just before the fifth in position or time or degree or magnitude.
- usage: "the quaternary period of geologic time extends from the end of the tertiary period to the present"
- synonyms: fourth, quaternary
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). 4th. Retrieved September 20, 2026, from http://smartdefine.org/4th/definitions/1166941 |
| Chicago | WordNet. 2010. "4th" http://smartdefine.org/4th/definitions/1166941 (accessed September 20, 2026). |
| Harvard | WordNet 2010, 4th, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/4th/definitions/1166941>. |
| MLA | WordNet. "4th" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/4th/definitions/1166941> |