Fifth (?), a. [OE. fifte, fifthe, AS. fifta. See Five.]
1.
Next in order after the fourth; -- the ordinal of five.
2.
Consisting of one of five equal divisions of a thing.
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.
© Webster 1913.
Fifth (?), n.
1.
The quotient of a unit divided by five; one of five equal parts; a fifth part.
<-- a fifth of whiskey = a fifth of a gallon -->
2. Mus.
The interval of three tones and a semitone, embracing five diatonic degrees of the scale; the dominant of any key.
© Webster 1913.