Webster's Revised Unabridged Dictionary · 1913

Vast

Vast (vȧst) , adjective

[Latin vastus empty, waste, enormous, immense: compare French vaste. See Waste, and compare Devastate.]

1.
Waste; desert; desolate; lonely. [Obsolete]
The empty, vast, and wandering air. — Shakespeare
2.
Of great extent; very spacious or large; also, huge in bulk; immense; enormous; as, the vast ocean; vast mountains; the vast empire of Russia.
Through the vast and boundless deep. — Milton
3.
Very great in numbers, quantity, or amount; as, a vast army; a vast sum of money.
4.
Very great in force; mighty; as, vast labor.
5.
Very great in importance; as, a subject of vast concern.

Vast , noun

A waste region; boundless space; immensity.
The watery vast. — Pope
Michael bid sound The archangel trumpet. Through the vast of heaven It sounded. — Milton