quinquenniad/kwɪŋˈkwɛniəd/EtymologyFrom Latin quinquennis (“5-year”) + -ad.quinquenniad means Synonym of quinquennium: A 5-year period. Lexicurio rates it Rare gem — a strength score of 73 out of 100.nounSynonym of quinquennium: A 5-year period.