Fifth Definition

fĭfth, fĭth

noun

The one following the fourth.

Webster's New World

The ordinal number matching the number five in a series.

American Heritage

Any of the five equal parts of something;¹₅

Webster's New World

A unit of liquid measure for alcoholic beverages, equal to a fifth of a gallon (0.757 liter)

Webster's New World

A bottle of alcohol with a capacity of one fifth of a gallon.

Webster's New World

Synonyms:

pronoun

(chiefly US) Fifth Street.

Wiktionary

(chiefly US, informal, with the) The Fifth Amendment.

Wiktionary

(chiefly US, informal, with the, by extension) The right not to give self-incriminating testimony.

Wiktionary

adjective

Preceded by four others in a series; 5th.

Webster's New World

Designating any of the five equal parts of something.

Webster's New World

The ordinal form of the number five.

Wiktionary

Synonyms:

adverb

In the fifth place, rank, group, etc.

Webster's New World

Other Word Forms of Fifth

Singular:

fifth

Plural:

fifths

From Middle English fifthe, fifte, fift, from Old English fīfta (“fifth”), from Proto-Germanic *femftô (“fifth”), equivalent to five +‎ -th. Cognate with Scots fift, fyft (“fifth”), North Frisian fyfde (“fifth”), West Frisian fyfde (“fifth”), Dutch vijfde (“fifth”), Low German fifte, föfte, füfte (“fifth”), German fünfte (“fifth”), Danish femte (“fifth”), Swedish femte (“fifth”), Icelandic fimmta (“fifth”).

From Wiktionary
From the name of the Fifth Amendment to the United States Constitution, protecting various rights in United States legal proceedings.

From Wiktionary
Middle English from Old English fīfta penkwe in Indo-European roots

From American Heritage Dictionary of the English Language, 5th Edition