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Adjective: erstwhile  'urst,wI(-u)l
  1. Belonging to some prior time
    "erstwhile friend";
    - former, old, onetime, one-time, quondam, sometime
Adverb: erstwhile  'urst,wI(-u)l
Usage: archaic
  1. At a previous time
    "her erstwhile writing";
    - once, formerly, at one time, erst [archaic], sometime [archaic]

See also: past

Encyclopedia: Erstwhile