fourth

This term functions as an ordinal number, designating a specific position in a linear sequence. It carries a neutral, precise connotation and is used primarily for indexing, ranking, or chronological ordering. While it is most common in mathematical or sequential lists, it also appears in temporal contexts to mark the fourth single unit of a time series.

When used as a noun or adjective referring to a fraction, it describes one of four equal parts of a whole. In this specific capacity, the word can be used as a countable noun, allowing for the plural form fourths when referring to multiple quarters of various wholes.