Source : Webster's Revised Unabridged Dictionary (1913)

Eternally \E*ter"nal*ly\, adv.
   In an eternal manner.

         That which is morally good or evil at any time or in
         any case, must be also eternally and unchangeably so.
                                                  --South.

         Where western gales eternally reside.    --Addison.

Source : WordNet®

eternally
     adv : for a limitless time; "no one can live forever"; "brightly
           beams our Father's mercy from his lighthouse evermore"-
           P.P.Bliss [syn: {everlastingly}, {forever}, {evermore}]