Etymology

infectiously

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Today it means: In an infectious manner. Full definition →

Proto-Germanic *līką ← Proto-Indo-European *leyg- ← English infectious
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The story

  1. Englishinfectious
  2. Proto-Indo-European*leyg-
  3. Proto-Germanic*līką
  4. English todayinfectiously

From infectious + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.