Etymology

thirdly

T1H4I1R1D2L1Y4

Today it means: In the third place; third in a row. Full definition →

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

  1. Englishthird
  2. Proto-Indo-European*leyg-
  3. Proto-Germanic*līką
  4. English todaythirdly

From third + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.