This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Happening once every five years.

adj. Lasting for five years.

n. A fifth anniversary.

n. A period of five years.

adj. that happens every five years

adj. that lasts for five years

n. a fifth anniversary

n. a five year period

adj. Occurring once in five years, or at the end of every five years; also, lasting five years. A quinquennial event.

Occurring once in five years.

Recurring in the fifth year, reckoning both years of occurrence; occurring every fourth year. See II., 2.

Lasting five years.

n. A period of five years; a quinquenniad; hence, something characterized by such a period or interval, as an anniversary, or a college catalogue.

n. A festival or celebration occurring once in four years; an anniversary in the fifth year.

"This festival was celebrated with spectacles and games of various kinds, which were called the quinquennial games, from the circumstance that the period for the celebration of them recurred once in five years."

neo-soviet    eco-film    decennial    demobilisation    high-page