Etymology

extensively

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Today it means: In an extensive manner, widely. Full definition →

English extensive ← Middle English extensive ← Late Latin extensīvus
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The story

  1. Late Latinextensīvus
  2. Middle Englishextensive
  3. Englishextensive
  4. English todayextensively

From extensive + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.