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

  • n. The ordinal number matching the number four in a series.
  • n. One of four equal parts.
  • n. Music A tone four degrees above or below a given tone in a diatonic scale.
  • n. Music The interval between two such tones.
  • n. Music The harmonic combination of these tones.
  • n. Music The subdominant of a scale or key.
  • n. The transmission gear or gear ratio used to produce forward speeds next higher to those of third in a motor vehicle.
  • n. The Fourth of July; Independence Day. Used with the: went to a parade on the Fourth.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. The ordinal form of the number four.
  • n. The person or thing in the fourth position.
  • n. A quarter, one of four equal parts of a whole.
  • n. The fourth gear of an engine.
  • n. A musical interval which spans four degrees of the diatonic scale, for example C to F (C D E F).

from the GNU version of the Collaborative International Dictionary of English

  • adj. Next in order after the third; the ordinal of four.
  • adj. Forming one of four equal parts into which anything may be divided.
  • n. One of four equal parts into which one whole may be divided; the quotient of a unit divided by four.
  • n. The interval of two tones and a semitone, embracing four diatonic degrees of the scale; the subdominant of any key.
  • n. One coming next in order after the third.

from The Century Dictionary and Cyclopedia

  • Next after the third: an ordinal numeral.
  • n. The quotient of unity divided by four; one of four equal parts of anything; a quarter: as, three fourths (¾) of an acre.
  • n. In early English law, a fourth part of the rents of the year, or of movables, or both, granted or levied by way of tax.
  • n. In music A tone four diatonic degrees above or below any given tone.
  • n. The interval between any tone and a tone four degrees distant from it.
  • n. The harmonic combination of two such tones.
  • n. In a scale, the fourth tone from the bottom; the subdominant: solmizated fa, as F in the scale of C, or D in that of A.

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

  • n. the musical interval between one note and another four notes away from it
  • adj. coming next after the third and just before the fifth in position or time or degree or magnitude
  • adv. in the fourth place
  • n. following the third position; number four in a countable series
  • n. one of four equal parts


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

Middle English fourthe, from Old English fēortha; see kwetwer- in Indo-European roots.



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