The Collaborative International Dictionary of English v.0.48:

Repeatedly \Re*peat"ed*ly\, adv.
   More than once; again and again; indefinitely.
   [1913 Webster]

WordNet (r) 3.0 (2006):

repeatedly
    adv 1: several time; "it must be washed repeatedly"

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "repeatedly":
   again and again, commonly, day after day, day by day, frequently,
   habitually, in many instances, many a time, many times,
   many times over, most often, much, not infrequently, not seldom,
   oft, often, often enough, oftentimes, ofttimes, ordinarily,
   over again, over and over, recurrently, repetitively, routinely,
   several times, time, time after time, time and again,
   times without number, unseldom, usually, whenever you wish,
   year after year