Is “Quinquennial” a Scrabble word?
Yes
QUINQUENNIAL
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Quinquennial
/kwɪŋˈkwɛ.ni.əl/
noun
1.A fifth anniversary.
2.A five-year period.
adjective
1.That happens every five years.
2.That lasts for five years.
Synonyms: pentennial