What does "tercentennial" mean?

The three-hundredth anniversary of an event; tricentennial.

What is a synonym for "tercentennial"?

Common synonyms include: anniversary, bicentennial, biennial, birthday, centenarian, centennial.

noun

noun ·Rare ·Advanced level

Noun

1
The three-hundredth anniversary of an event; tricentennial.
"2006 was the tercentennial of Benajmin Franklin's birth."
2
the 300th anniversary (or the celebration of it) wordnet

"2006 was the tercentennial of Benajmin Franklin's birth."

See tricentennial.