fifth

fifth is an Adverb

Definition:

[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.