vast

adj

1. Very large or wide (literally or figuratively).

   “The Sahara desert is vast.”

   “There is a vast difference between them.”

   “They and the airline itself described an internal process that requires multiple departments to manually redesign the airline’s schedule – a system that works “the vast majority of the time,” Southwest said in a statement.”

2. Very great in size, amount, degree, intensity, or especially extent.

   “The exiguity and ſmallneſſe of ſome ſeeds extending to large productions is one of the magnalities of nature, ſomewhat illuſtrating the work of the Creation, and vaſt production from nothing.”

   “Another place where, from the aesthetic point of view, a long tunnel would have been a real blessing, is East London as viewed from the carriage window on the old Great Eastern line. Despite a vast change from crowded slums to tracts of wasteland, due to its grim wartime experience, this approach still provides a shabby and unworthy introduction to the great capital.”

   “Last spring, the periodical cicadas emerged across eastern North America. Their vast numbers and short above-ground life spans inspired awe and irritation in humans—and made for good meals for birds and small mammals.”

3. (obsolete)Waste; desert; desolate; lonely.

   “the empty, vast, and wandering air”

noun

1. (poetic)A vast space.

   “they have seemed to be together, though absent, shook hands, as over a vast, and embraced, as it were, from the ends of opposed winds.”

2. (abbreviation, acronym, alt-of)Acronym of visual audio sensory theater.
3. (abbreviation, acronym, alt-of)Acronym of volcanic ash strategic initiative team.