- When someone refers to "drinking by the fifth" or drinking "a fifth," he is talking about a measurement of alcohol. This term is most often used to quantify amounts of liquor, as bottles of liquor usually come in amounts of fifths.
- A fifth measurement is approximately a fifth of a gallon. This amounts to about 25.6 ounces, which is about 25.6 shots.
- Most hard liquor is sold in bottles where the product inside amounts to a fifth. However, the liquor will not be identified as being measured in fifth amounts; instead, the label will usually state that the bottle contains 750 mL of alcohol.
Meaning
Amount
Packaging
Source...