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WORDNET DICTIONARY

Noun quinquennium has 1 sense

• quinquennium(n = noun.time) - a period of five years;
is a kind of period, period of time, time period

CIDE DICTIONARY

OXFORD DICTIONARY

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