The Collaborative International Dictionary of English v.0.48:

Eventually \E*ven"tu*al*ly\, adv.
   In an eventual manner; finally; ultimately.
   [1913 Webster]

WordNet (r) 3.0 (2006):

eventually
    adv 1: after an unspecified period of time or an especially long
           delay [syn: finally, eventually]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "eventually":
   after all, as things go, as times go, at last, at length,
   at long last, at the end, at the last, conclusively, finally,
   in conclusion, in due course, in due season, in due time, in fine,
   in time, last, lastly, once for all, someday, sometime, somewhen,
   sooner or later, ultimately, yet