Source : Webster's Revised Unabridged Dictionary (1913)

Fortunately \For"tu*nate*ly\, adv.
   In a fortunate manner; luckily; successfully; happily.

Source : WordNet®

fortunately
     adv : by good fortune; "fortunately the weather was good" [syn: {fortuitously},
            {luckily}, {as luck would have it}] [ant: {unfortunately},
            {unfortunately}]