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[fawrth, fohrth] /fɔrθ, foʊrθ/
next after the third; being the ordinal number for four.
being one of four equal parts.
Automotive. of, relating to, or operating at the gear transmission ratio at which the drive shaft speed is greater than that of third gear for a given engine crankshaft speed, but not so great as that of fifth gear, if such exists:
fourth gear.
a fourth part, especially of one (¼).
the fourth member of a series.
  1. a tone on the fourth degree from a given tone (counted as the first).
  2. the interval between such tones.
  3. the harmonic combination of such tones.
Automotive. fourth gear:
She downshifted from fifth to fourth as we started up the hill.
(initial capital letter) Independence Day; the Fourth of July (usually preceded by the).
in the fourth place; fourthly.
Origin of fourth
before 950; Middle English fourthe, Old English fēowertha. See four, -th2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for fourth
Contemporary Examples
Historical Examples
  • On the fourth and fifth days, however, he had the reward for his caution.

    Way of the Lawless Max Brand
  • He was the head of the school when I, the elder, was a lout in the lower fourth.

    Viviette William J. Locke
  • The "missing fourth side" of the room is a commonplace recognized by all.

    The Dramatic Values in Plautus Wilton Wallace Blancke
  • It should not be a tomb save as upon the fourth day the sepulchre in the garden!

    Weighed and Wanting George MacDonald
  • Look here; he ain't that Roberts from the big store on fourth Street?

    Ester Ried Yet Speaking Isabella Alden
British Dictionary definitions for fourth


adjective (usually prenominal)
  1. coming after the third in order, position, time, etc. Often written: 4th
  2. (as noun): the fourth in succession
denoting the fourth forward ratio of a gearbox in motor vehicles
  1. the interval between one note and another four notes away from it counting inclusively along the diatonic scale
  2. one of two notes constituting such an interval in relation to the other See also perfect (sense 9), interval (sense 5), diminished (sense 2)
the fourth forward ratio of a gearbox in a motor vehicle: he changed into fourth as soon as he had passed me
a less common word for quarter (sense 2)
after the third person, position, event, etc
sentence connector
as the fourth point: linking what follows with the previous statements, as in a speech or argument
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fourth

mid-15c., alteration, by influence of four, of ferthe, from Old English feorða; see four + -th (1). Cf. Old Saxon fiortho, Old Norse fiorðe, Dutch vierde, Old High German fiordo, German vierte.

Online Etymology Dictionary, © 2010 Douglas Harper
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fourth in Medicine

fourth (fôrth)

  1. Coming after third, as in order, place, rank, time, or quality.

  2. Being the digit that is next to and on the outermost side of the third digit, as on a foot.

fourth n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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