Quintennialadjective
quinquennial
Quinquennialadjective
That happens every five years.
Quinquennialadjective
That lasts for five years.
Quinquennialnoun
A fifth anniversary.
Quinquennialnoun
A five-year period.
Quinquennialadjective
Occurring once in five years, or at the end of every five years; also, lasting five years. A quinquennial event.