quinquennium
Pronunciation: /kwɪŋˈkwɛnɪəm/
Definition of quinquennium
noun ( plural quinquennia /-nɪə/ or quinquenniums)
Origin:
early 17th century: from Latin, from quinque 'five' + annus 'year'
early 17th century: from Latin, from quinque 'five' + annus 'year'