Source : Webster's Revised Unabridged Dictionary (1913)

Immense \Im*mense"\, a. [L. immensus; pref. im- not + mensus, p.
   p. of metiri to measure: cf. F. immense. See {Measure}.]
   Immeasurable; unlimited. In commonest use: Very great; vast;
   huge. ``Immense the power'' --Pope. ``Immense and boundless
   ocean.'' --Daniel.

         O Goodness infinite! Goodness immense!   --Milton.

   Syn: Infinite; immeasurable; illimitable; unbounded;
        unlimited; interminable; vast; prodigious; enormous;
        monstrous. See {Enormous}.

Source : WordNet®

immense
     adj : 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 [syn: {huge}, {vast}, {Brobdingnagian}]