fourth

[fawrth, fohrth]
adjective
1.
next after the third; being the ordinal number for four.
2.
being one of four equal parts.
3.
Automotive. of, pertaining 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.
noun
4.
a fourth part, especially of one (¼).
5.
the fourth member of a series.
6.
Music.
a.
a tone on the fourth degree from a given tone (counted as the first).
b.
the interval between such tones.
c.
the harmonic combination of such tones.
7.
Automotive. fourth gear: She downshifted from fifth to fourth as we started up the hill.
8.
(initial capital letter) Independence Day; the Fourth of July (usually preceded by the ).
adverb
9.
in the fourth place; fourthly.

Origin:
before 950; Middle English fourthe, Old English fēowertha. See four, -th2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
fourth (fɔːθ)
 
adj
1.  a.  coming after the third in order, position, time, etc. Often written: 4th
 b.  (as noun): the fourth in succession
2.  denoting the fourth forward ratio of a gearbox in motor vehicles
 
n
3.  music
 a.  the interval between one note and another four notes away from it counting inclusively along the diatonic scale
 b.  perfect interval See also diminished one of two notes constituting such an interval in relation to the other
4.  the fourth forward ratio of a gearbox in a motor vehicle: he changed into fourth as soon as he had passed me
5.  a less common word for quarter
 
adv
6.  after the third person, position, event, etc
 
sentence connector
7.  as the fourth point: linking what follows with the previous statements, as in a speech or argument

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

fourth (fôrth)
adj.

  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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Example sentences
Abbott entices the reader to imagine how our own world would relate to a fourth
  spatial dimension.
One fourth to one half of the annual rainfall percolates downward, becoming
  groundwater.
The messages in the first three were pretty easy, but the fourth threw a few of
  you.
Or it may be that they belong to a fourth domain of living organism.
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