Source : Webster's Revised Unabridged Dictionary (1913)

Formerly \For"mer*ly\, adv.
   In time past, either in time immediately preceding or at any
   indefinite distance; of old; heretofore.

Source : WordNet®

formerly
     adv : at a previous time; "once he loved her"; "her erstwhile
           writing" [syn: {once}, {at one time}, {erstwhile}, {erst}]