Etymology

parenthetically

P3A1R1E1N1T1H4E1T1I1C3A1L1L1Y4

Today it means: As an aside, incidentally. Full definition →

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

  1. Englishparenthetical
  2. Proto-Indo-European*leyg-
  3. Proto-Germanic*līką
  4. English todayparenthetically

From parenthetical + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.