The Collaborative International Dictionary of English v.0.48:
Formerly \For"mer*ly\, adv. In time past, either in time immediately preceding or at any indefinite distance; of old; heretofore. [1913 Webster]WordNet (r) 3.0 (2006):
formerly adv 1: at a previous time; "at one time he loved her"; "her erstwhile writing"; "she was a dancer once"; [syn: once, formerly, at one time, erstwhile, erst]