eighteenth

Etymology

From Middle English eiʒtenþe, from Old English eahtatēoþa, from Proto-Germanic *ahtudô tehundô.

adj

  1. The ordinal form of the number eighteen.

noun

  1. The person or thing in the eighteenth position.
  2. One of eighteen equal parts of a whole.
  3. (informal) A party to celebrate an eighteenth birthday.

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