Is “Quadrennium” a Scrabble word?
Yes
QUADRENNIUM
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 Quadrennium
/kwɑˈdɹɛnːjəm/
noun
1.A period of 4 years, the sets of four years in the Egyptian and Greek calendars.
Synonyms: tetraeterid, tetraeteris