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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

★ In the United States, the Fifth Amendment to the United States Constitution especially as in the expression "Taking the Fifth".

★ Fifth (Stargate), a robotic character in the television series Stargate SG-1

★ A Fifth-generation programming language

★ Beethoven's fifth symphony (commonly referred to as 'The Fifth')

★ 5 (Soft Machine album)

★ A common term for 750 mL of hard liquor, approximately one fifth of a U.S. gallon.

★ A political term, fifth column

★ Fifth disease - a contagious rash that spreads in school aged children

★ Fifth force - a proposed force of nature in addition to the four known fundamental forces
In music theory:

★ A musical interval; specifically, a perfect fifth, diminished fifth or augmented fifth

★ A chord member separated from the chord's root by one of the above intervals

★ The dominant or fifth diatonic scale degree, and the chord built on it