A vast space.
"The acronym VAST stands for Visual Audio Sensory Theater, which is used in some specialized educational programs to describe immersive learning environments."
Acronym of visual audio sensory theater.
"The vast of this region is covered in endless desert sand."
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"
Very large or wide (literally or figuratively).
"The vast ocean stretched endlessly before us, filling our entire view."
In plain English: Vast means extremely large in size, amount, or scope.
"The vast ocean stretched out before us to the horizon."
Usage: Use vast to describe immense size, scope, or quantity in both literal and figurative contexts. It is often interchangeable with huge but carries a slightly more formal tone when describing abstract concepts like differences or distances.
The word vast comes from the Middle French vaste, which was borrowed from the Latin vastus. Originally meaning "void," it traveled into English with that sense of emptiness before evolving to describe something immensely large.