fourth
n.n. the position of number four in a series. You use it to describe the person or thing that comes after the third one.
n. constituting number four in a sequence; the ordinal number matching the cardinal number four.
This is the fourth time I have called you today.
She finished in fourth place, just missing out on a bronze medal by a few seconds.
The fourth movement of the symphony introduces a haunting melody that contrasts sharply with the energetic themes established in the earlier sections.
Inherited from Middle English fourthe, an alteration (due to four) of ferthe, from Old English fēorþa, fēowerþa, from Proto-West Germanic feurþō, from Proto-Germanic fedurþô, equivalent to four + -th (ordinal suffix). Cognates Compare West Frisian fjirde, Saterland Frisian fjädde, fjoode, Dutch vierde, German Low German feerde, feerd, German vierte, Danish fjerde, Icelandic fjórði.
As an ordinal number, it is almost always preceded by the definite article 'the' when used as a noun or adjective.
on the four of Julyon the fourth of JulyDates require ordinal numbers like 'fourth', not cardinal numbers like 'four'.