Fifth
A fifth may mean any of three things:
1. In music, see the intervals:
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 (1/5th or 0.2) of a gallon, or 757mL. 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 of 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 amendment.
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