Etymology

seventh

sev·enth
S1E1V4E1N1T1H4

Today it means: The ordinal form of the number seven. Full definition →

Middle English seventhe ← Old English seofoþa ← Proto-West Germanic *sebundō
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The story

  1. Proto-Germanic · inherited from*sebundô
  2. Proto-West Germanic · inherited from*sebundō
  3. Old English · inherited fromseofoþa
  4. Middle English · inherited fromseventhe
  5. English todayseventh

From Middle English seventhe, sefte, from Old English seofoþa, from Proto-West Germanic *sebundō, from Proto-Germanic *sebundô. The -n-, lost in northern Proto-West Germanic, was later reinserted by analogy with seven, equivalent to seven + -th.

Etymology from Wiktionary, CC BY-SA 4.0.