Source : Webster's Revised Unabridged Dictionary (1913)

Massive \Mass"ive\, a. [F. massif.]
   1. Forming, or consisting of, a large mass; compacted;
      weighty; heavy; massy. ``Massive armor.'' --Dr. H. More.

   2. (Min.) In mass; not necessarily without a crystalline
      structure, but having no regular form; as, a mineral
      occurs massive.

   {Massive rock} (Geol.), a compact crystalline rock not
      distinctly schistone, as granite; also, with some authors,
      an eruptive rock.

Source : WordNet®

massive
     adj 1: imposing in size or bulk or solidity; "massive oak doors";
            "Moore's massive sculptures"; "the monolithic
            proportions of Stalinist architecture"; "a monumental
            scale" [syn: {monolithic}, {monumental}]
     2: being the same substance throughout; "massive silver"
     3: imposing in scale or scope or degree or power; "massive
        retaliatory power"; "a massive increase in oil prices";
        "massive changes"
     4: consisting of great mass; containing a great quantity of
        matter; "Earth is the most massive of the terrestrial
        planets"