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Fifth may refer to: One fifth, a quintile, or 20% of a certain amount
The fifth in a series, or four after the first
A term for 750 ml of hard liquor. Technically a misnomer, since one fifth of a gallon is 757 ml. This quantity of alcohol was therefore referred to as one hundred twenty seven six hundred forty firsts until it was realized that 127/641 of a gallon is actually 749.999228 ml.
In music theory:
A chord member separated from the chord's root by one of the above intervals
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