- (superl.) Very great in numbers, quantity or amount; as, a vast army; a vast sum of money.
- (n.) A waste region; boundless space; immensity.
- (superl.) Waste; desert; desolate; lonely.
- (superl.) Very great in importance; as, a subject of vast concern.
- (superl.) Of great extent; very spacious or large; also, huge in bulk; immense; enormous; as, the vast ocean; vast mountains; the vast empire of Russia.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). vast. Retrieved September 21, 2026, from http://smartdefine.org/vast/definitions/2078870 |
| Chicago | Webster's. 2011. "vast" http://smartdefine.org/vast/definitions/2078870 (accessed September 21, 2026). |
| Harvard | Webster's 2011, vast, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/vast/definitions/2078870>. |
| MLA | Webster's. "vast" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/vast/definitions/2078870> |