What is the meaning of vast?

adjective

• 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
  • synonyms: huge, immense, Brobdingnagian