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erstwhile Meaning, Definition & Usage

  1. adjective satellite belonging to some prior time
    old; quondam; onetime; sometime; one-time; former.
    • erstwhile friend
    • our former glory
    • the once capital of the state
    • her quondam lover
  2. adverb at a previous time;
    erst; at one time; formerly; once.
    • at one time he loved her
    • her erstwhile writing
    • she was a dancer once
WordNet

Erst`while" adverb
Definitions
  1. Till then or now; heretofore; formerly. Archaic

Webster 1913