See also: vast, väst, and -vast English English Wikipedia has an article on:VASTWikipedia Noun VAST (plural VASTs) Acronym of visual audio sensory theater. (ESA, volcanology) Acronym of volcanic ash strategic initiative team. Anagrams ATVs, tavs, VTAs, vats, VSATWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads