Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The ordinal number matching the number 18 in a series.
  • n. One of 18 equal parts.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. The ordinal form of the number eighteen.
  • n. The person or thing in the eighteenth position.
  • n. One of eighteen equal parts of a whole.
  • n. A party to celebrate an eighteenth birthday.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Next in order after the seventeenth.
  • adj. Consisting of one of eighteen equal parts or divisions of a thing.
  • n. The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions.
  • n. The eighth after the tenth.

from The Century Dictionary and Cyclopedia

  • Next after the seventeenth: an ordinal numeral.
  • n. The quotient of unity divided by eighteen; one of eighteen equal parts of anything; an eighteenth part.
  • n. In music, an interval comprehending two octaves and a fourth.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. coming next after the seventeenth in position
  • n. position 18 in a countable series of things

Etymologies

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