vast vast /ˈvæst/

adjective

1. () Unusually great in size or amount or degree or especially extent or scope  ( Brobdingnagian , immense , huge , vast )
   unusually great in size or amount or degree or especially extent or scope
    Huge government spending
   huge government spending
    Huge country estates
   huge country estates
    Huge popular demand for higher education
   huge popular demand for higher education
    A huge wave
   a huge wave
    The Los Angeles aqueduct winds like an immense snake along the base of the mountains
   the Los Angeles aqueduct winds like an immense snake along the base of the mountains
    Immense numbers of birds
   immense numbers of birds
    At vast (or immense) expense
   at vast (or immense) expense
    The vast reaches of outer space
   the vast reaches of outer space
    The vast accumulation of knowledge...which we call civilization
   the vast accumulation of knowledge...which we call civilization