Etymology

ninth

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

Middle English nynthe ← Old English niġoþa ← Proto-Germanic *newundô
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The story

  1. Proto-Germanic · inherited from*newundô
  2. Old English · inherited fromniġoþa
  3. Middle English · inherited fromnynthe
  4. English todayninth

From Middle English nynthe, nynte, from Old English niġoþa, from Proto-Germanic *newundô; the -n- was reinserted by analogy with nine. Equivalent to nine + -th (ordinal suffix).

Etymology from Wiktionary, CC BY-SA 4.0.