The three-hundredth anniversary of a significant event; a tercentenary.
- ‘The newly re-created Amber Room opened to the public in June 2003 for the tricentennial celebration of St. Petersburg (formerly Leningrad).’
- ‘The two companion monuments, one on each side of the Detroit River, will be dedicated in October as a crescendo to Detroit's yearlong, binational tricentennial celebration.’
- ‘In the 1980s the Rembrandt Research Project, founded during the Rembrandt tricentennial celebrations of 1969, became the most public of art historical endeavors.’
- ‘Two decades into the third century of that experiment, it is no longer clear that the tricentennial anniversary of the Declaration of Independence will take place in a country living in continuity with its moral-cultural roots.’
- ‘We have a long road ahead of us, but think of what could be here at Hakalau Forest for the Refuge System's tricentennial celebration!’
Relating to a three-hundredth anniversary; tercentenary.