Source : Webster's Revised Unabridged Dictionary (1913)

Largely \Large"ly\, adv.
   In a large manner. --Dryden. Milton.

Source : WordNet®

largely
     adv 1: in large part; mainly or chiefly; "These accounts are
            largely inactive" [syn: {mostly}, {for the most part}]
     2: on a large scale; "the sketch was so largely drawn that you
        could see it from the back row"