Word Study
quinquennium
OXFORD DICTIONARY
quinquennium, n. (pl. quinquenniums or quinquennia) a period of five years.
Etymology
L f. quinque five + annus year
ROGET THESAURUS
quinquennium
Period
N period, age, era, second, minute, hour, day, week, month, quarter, year, decade, decenniumm lustrum, quinquennium, lifetime, generation, epoch, ghurry, lunation, moon, century, millennium, annus magnus, horary, hourly, annual.For further exploring for "quinquennium" in Webster Dictionary Online