Quinquennalia

Webster's Dictionary

(n. pl.) Public games celebrated every five years.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

games celebrated among the ancient Romans in imitation of the Greek festivals at the end of every four years. On these occasions keen competitions were carried on in music, gymnastics, and horse-racing. Quinquennalia were observed in honor of Julius Caesar, and also of Augustus; but they seem to have been celebrated with peculiar splendor under Nero, from whose time they were discontinued, until at length they were revived by Domitian in honor of Jupiter Capitolinus.