Source : Webster's Revised Unabridged Dictionary (1913)

Naturally \Nat"u*ral*ly\, adv.
   In a natural manner or way; according to the usual course of
   things; spontaneously.

Source : WordNet®

naturally
     adv 1: as might be expected; "naturally, the lawyer sent us a huge
            bill" [syn: {of course}, {course}] [ant: {unnaturally}]
     2: through inherent nature; "he was naturally lazy" [syn: {by
        nature}]
     3: according to nature; by natural means; without artificial
        help; "naturally grown flowers" [ant: {artificially}]
     4: in a natural or normal manner; "speak naturally and easily"
        [ant: {unnaturally}]