adj
fifth
fihfth
adj
1
Coming after four others in a sequence; the ordinal form of five.
"He finished fifth in the marathon."
noun
1
One of five equal parts of something.
"She owns a fifth of the company’s shares."
2
A bottle of liquor equal to about 750 milliliters, historically one-fifth of a US gallon.
"He picked up a fifth of whiskey on the way home."
How to Use Fifth
Learner’s notesIn plain EnglishNumber five in order, one part out of five, or (in American usage) a standard-size liquor bottle.
UK vs US
The "bottle of liquor" sense is chiefly American.
Common pairings
a fifth of vodka
finish in fifth
Word Forms
fifthed past tense, fifths plural, fifths singular
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Etymology
From Old English fifta, built from "five" plus the ordinal ending "-th."