Meaning

noun the cardinal number that is the sum of four and one

noun one of five children born at the same time from the same pregnancy

origin* From Middle French quint, from Latin quīntus. Doublet of quintus. * (firefighting vehicle): In reference to its five functions: pump, water tank, fire hose, aerial device, and ground ladders.

Etymology from Wiktionary, CC BY-SA 3.0