Etymology

secondly

sec·ond·ly
S1E1C3O1N1D2L1Y4

Today it means: In the second place. Full definition →

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

  1. Proto-Indo-European*sekʷ-
  2. Proto-Italic*sekʷondo-
  3. Latinsecundu
  4. Old Frenchsecond
  5. Middle Englishsecunde
  6. Englishsecond
  7. Proto-Indo-European*leyg-
  8. Proto-Germanic*līką
  9. English todaysecondly

From second + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.