Source : Webster's Revised Unabridged Dictionary (1913)

Brobdingnagian \Brob`ding*nag"i*an\, a. [From Brobdingnag, a
   country of giants in ``Gulliver's Travels.'']
   Colossal; of extraordinary height; gigantic. -- n. A giant.
   [Spelt often {Brobdignagian}.]

Source : WordNet®

Brobdingnagian
     adj 1: huge; relating to or characteristic of the imaginary country
            of Brobdingnag
     2: 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},
         {immense}, {vast}]