Etymology

efficaciously

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Today it means: in an efficacious manner Full definition →

English efficacious ← Old French efficacieux ← Latin efficāx
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The story

  1. Latinefficāx
  2. Old Frenchefficacieux
  3. Englishefficacious
  4. English todayefficaciously

From efficacious + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.