Source : Webster's Revised Unabridged Dictionary (1913)

Amass \A*mass"\, v. t. [imp. & p. p. {Amassed}; p. pr. & vb. n.
   {Amassing}.] [F. ambusher, LL. amassare; L. ad + massa lump,
   mass. See {Mass}.]
   To collect into a mass or heap; to gather a great quantity
   of; to accumulate; as, to amass a treasure or a fortune; to
   amass words or phrases.

         The life Homer has been written by amassing all the
         traditions and hints the writers could meet with.
                                                  --Pope.

   Syn: To accumulate; heap up; pile.

Amass \A*mass"\, n. [OF. amasse, fr. ambusher.]
   A mass; a heap. [Obs.] --Sir H. Wotton.

Source : WordNet®

amass
     v 1: collect or gather; "Journals are accumulating in my office";
          "The work keeps piling up" [syn: {accumulate}, {cumulate},
           {conglomerate}, {pile up}, {gather}]
     2: get or gather together; "I am accumulating evidence for the
        man's unfaithfulness to his wife"; "She is amassing a lot
        of data for her thesis"; "She rolled up a small fortune"
        [syn: {roll up}, {collect}, {accumulate}, {pile up}, {compile},
         {hoard}]