Webster’s Revised Unabridged Dictionary · 1913
Vast
Vast (vȧst), a. [Compar. Vaster; superl. Vastest.] [L. vastus empty, waste, enormous, immense: cf. F. vaste. See Waste, and cf. Devastate.]
1. Waste; desert; desolate; lonely. [Obs.]
The empty, vast, and wandering air. Shak.
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 importance; as, a subject of vast concern.
Syn. — Enormous; huge; immense; mighty.
Vast, n. A waste region; boundless space; immensity. "The watery vast." Pope.
Michael bid sound The archangel trumpet. Through the vast of heaven It sounded. Milton.