Fourth

[fawrth, fohrth] /fɔrθ, foʊrθ/

adjective
1.
next after the third; being the ordinal number for four.
2.
being one of four equal parts.
3.
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.
noun
4.
a fourth part, especially of one (¼).
5.
the fourth member of a series.
6.
Music.

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; .
/fɔːθ/
adjective (usually prenominal)
1.

2.
denoting the fourth forward ratio of a gearbox in motor vehicles
noun
3.
(music)

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 (sense 2)
adverb
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
adj.

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.

fourth (fôrth)
adj.

fourth n.