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

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. The ordinal form of the number eight.
  • n. The person or thing in the eighth position.
  • n. One of eight equal parts of a whole.
  • n. An "eighth" of an ounce equalling approximately 3.5 grams in marijuana or other drugs.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Next in order after the seventh.
  • adj. Consisting of one of eight equal divisions of a thing.
  • n. The quotient of a unit divided by eight; one of eight equal parts; an eighth part.
  • n. The interval of an octave.

from The Century Dictionary and Cyclopedia

  • Next after the seventh: an ordinal numeral.
  • n. The quotient of unity divided by eight; one of eight equal parts of anything.
  • n. In music: The interval between any tone and a tone on the eighth diatonic degree above or below it; an octave.
  • n. A tone distant by an eighth or octave from a given tone; an octave or replicate. The eighth tone of a scale is really the prime or key-note of a replicate scale.
  • n. An eighth-note.
  • n. In early English law, an eighth part of the rents for the year, or of movables, or both, granted or levied by way of tax.

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

  • n. position eight in a countable series of things
  • adj. coming next after the seventh and just before the ninth in position
  • n. one part in eight equal parts


Middle English eighthe, from Old English eahtotha, from eahta, eight; see oktō(u) in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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