- (n.) Depression of tone; the state of being below the true pitch; -- opposed to sharpness or acuteness.
- (n.) Want of vivacity or spirit; prostration; dejection; depression.
- (n.) Want of variety or flavor; dullness; insipidity.
- (n.) The quality or state of being flat.
- (n.) Eveness of surface; want of relief or prominence; the state of being plane or level.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). flatness. Retrieved September 22, 2026, from http://smartdefine.org/flatness/definitions/2008467 |
| Chicago | Webster's. 2011. "flatness" http://smartdefine.org/flatness/definitions/2008467 (accessed September 22, 2026). |
| Harvard | Webster's 2011, flatness, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/flatness/definitions/2008467>. |
| MLA | Webster's. "flatness" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/flatness/definitions/2008467> |