V'ASTNESS, noun 1. Great extent; immensity; as the vastness of the ocean or of space. 2. Immense bulk and extent; as the vastness of a mountain. 3. Immense magnitude or amount; as the vastness of an army, or of the sums of money necessary to support it. 4. Immense importance.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI