Etymology

demonstrably

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Today it means: In such a manner that is capable of being demonstrated, shown, or proved (without doubt). Full definition →

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

  1. Englishdemonstrable
  2. Proto-Indo-European*leyg-
  3. Proto-Germanic*līką
  4. English todaydemonstrably

From demonstrable + -ly. First attested in the early 17th century.

Etymology from Wiktionary, CC BY-SA 4.0.