Etymology

eighteenth

eigh·teenth
E1I1G2H4T1E1E1N1T1H4

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

Middle English eightetenthe ← Old English eahtatēoþa ← Proto-Germanic *ahtudô tehundô
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The story

  1. Proto-Germanic · inherited from*ahtudô tehundô
  2. Old English · inherited fromeahtatēoþa
  3. Middle English · inherited fromeightetenthe
  4. English todayeighteenth

Inherited from Middle English eightetenthe, eightetethe, from Old English eahtatēoþa, from Proto-Germanic *ahtudô tehundô. Equivalent to eighteen + -th (ordinal suffix).

Etymology from Wiktionary, CC BY-SA 4.0.