Etymology

optionally

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Today it means: In an optional manner; not mandatorily. Full definition →

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

  1. Englishoption
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. Englishoptional
  5. Proto-Indo-European*leyg-
  6. Proto-Germanic*līką
  7. English todayoptionally

From optional + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.