'Erstwhile' definitions:

Definition of 'erstwhile'

(from WordNet)
adverb
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]
adjective
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)]

Definition of 'Erstwhile'

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