erstwhile

from WordNet (r) 3.0 (2006)

erstwhile
    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}]
    adj 1: belonging to some prior time; "erstwhile friend"; "our
           former glory"; "the once capital of the state"; "her
           quondam lover" [syn: {erstwhile(a)}, {former(a)}, {old},
           {onetime(a)}, {one-time(a)}, {quondam(a)}, {sometime(a)}]

from The Collaborative International Dictionary of English v.0.48

Erstwhile \Erst`while"\ (-hw[imac]l"), adv.
   Till then or now; heretofore; formerly. [Archaic] Erubescence

from Moby Thesaurus II by Grady Ward, 1.0

27 Moby Thesaurus words for "erstwhile":
      already, ancient, bygone, earlier, early, fore, former, formerly,
      heretofore, immemorial, late, old, olden, once, onetime, past,
      prehistoric, previous, previously, primeval, primitive, prior,
      quondam, recent, sometime, then, whilom

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