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The Collaborative International Dictionary of English v.0.48 (gcide)

Fifth \Fifth\, a. [OE. fifte, fifthe, AS. f[imac]fta. See
{Five}.]
1. Next in order after the fourth; -- the ordinal of five.
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2. Consisting of one of five equal divisions of a thing.
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{Fifth monarchy men} (Hist.), a fanatical sect in England, of
the time of the commonwealth, who maintained that there
would be a fifth universal monarchy, during which Christ
would reign on earth a thousand years.

{Fifth wheel}, a horizontal wheel or segment above the fore
axle of a carriage and beneath the body, forming an
extended support to prevent careening.
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Fifth \Fifth\, n.
1. The quotient of a unit divided by five; one of five equal
parts; a fifth part.
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2. (Mus.) The interval of three tones and a semitone,
embracing five diatonic degrees of the scale; the dominant
of any key.
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