Triennial Convention was created in 1814.
we should have celebrated the triennial anniversary of our runnig race at our high school.
The triennial festival was coming to town this year, as it did three years ago.
Echigo-Tsumari Art Triennial was created in 2003.
It is a triennial event. A triennial event happens three times a year.
W-----k has written: 'Mr. W-----k's speech against the bill for repealing the Triennial-Act'
Centennial
triennial
'triennial'
QUADENNIAL
The word is Triennial.
Triennial