Definition of vasts:
(adj) :
Very large or wide (literally or figuratively).
(adj) :
Very great in size, amount, degree, intensity, or especially extent.
(n) :
(poetic) A vast space.
(adj) :
(obsolete) Waste; desert; desolate; lonely.
(n) :
Acronym of visual audio sensory theater.
(n) :
(ESA, volcanology) Acronym of volcanic ash strategic initiative team.