Home › Words › T › tercentennialtercentennialtercentennial · noun — the three-hundredth anniversary of an event; tricentennial.Definition from Wiktionary (CC BY-SA 3.0).EtymologySee tricentennial.nounThe three-hundredth anniversary of an event; tricentennial.e.g.“2006 was the tercentennial of Benjamin Franklin's birth.”Definitions & examples from Wiktionary (CC BY-SA 3.0).