noun
- The first fourth of the Moon's period of revolution around the Earth. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). first quarter. Retrieved September 22, 2026, from http://smartdefine.org/first_quarter/definitions/1250129 |
| Chicago | WordNet. 2010. "first quarter" http://smartdefine.org/first_quarter/definitions/1250129 (accessed September 22, 2026). |
| Harvard | WordNet 2010, first quarter, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/first_quarter/definitions/1250129>. |
| MLA | WordNet. "first quarter" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/first_quarter/definitions/1250129> |