- (n.) The quotient of a unit divided by thirty; one of thirty equal parts.
- (a.) Next in order after the twenty-ninth; the tenth after the twentieth; -- the ordinal of thirty; as, the thirtieth day of the month.
- (a.) Constituting or being one of thirty equal parts into which anything is divided.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). thirtieth. Retrieved September 24, 2026, from http://smartdefine.org/thirtieth/definitions/2072164 |
| Chicago | Webster's. 2011. "thirtieth" http://smartdefine.org/thirtieth/definitions/2072164 (accessed September 24, 2026). |
| Harvard | Webster's 2011, thirtieth, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/thirtieth/definitions/2072164>. |
| MLA | Webster's. "thirtieth" 28 May 2011. Web. 24 September 2026. <http://smartdefine.org/thirtieth/definitions/2072164> |