Is “Quinquennium” a Scrabble word?
Yes
QUINQUENNIUM
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 Quinquennium
noun
1.A period of five years.
“During the quinquennium from 1991 to 1995, infant mortality increased.”
Synonyms: lustrum, quinquenniad, quintennium