Of great extent; very spacious or large; also, huge in bulk; immense; enormous; as, the vast ocean; vast mountains; the vast empire of Russia.
Very great in numbers, quantity, or amount; as, a vast army; a vast sum of money.
Very great in force; mighty; as, vast labor.
Very great in importance; as, a subject of vast concern.
A waste region; boundless space; immensity.
unusually great in size or amount or degree or especially extent or scope; "huge government spending"; "huge country estates"; "huge popular demand for higher education"; "a huge wave"; "the Los Angeles aqueduct winds like an immense snake along the base of the mountains"; "immense numbers of birds"; "at vast (or immense) expense"; "the vast reaches of outer space"; "the vast accumulation of knowledge...which we call civilization"- W.R.Inge
VAST stands for Visual Audio Sensory Theater, and is the brainchild of Los Angeles, California-based singer-songwriter and musician Jon Crosby.