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1. In music, see the intervals:

• perfect fifth
• augmented fifth
• diminished fifth
• circle of fifths

The dominant, and the chord built on the dominant, is often simply called the fifth as it is the fifth scale degree.

2. A fifth is also one-fifth (¹/₅^th or 0.2) of a gallon, or 757 mL. It is usually only used as an amount of grain alcohol, such as a fifth of vodka or tequila.

3. "The Fifth" also means the Fifth Amendment to the United States Constitution. "Pleading the Fifth" or "taking the Fifth" means refusing to testify against one's self, a right guaranteed to any accused person by the amendmentAmendment has at least two meanings: An amendment is a formal alteration to any official document or record, typically with the aim of improving it for the better. This alteration may take many forms, not only the addition of material (such as, for exampl.