Definition of tercentenary in English:
 tercentenary
nounPlural tercentenaries ˌtəːsɛnˈtiːn(ə)riˌtəːsɛnˈtɛn(ə)ri
The three-hundredth anniversary of a significant event.
 events arranged to mark the Library's tercentenary
 the conference celebrates the tercentenary of the Scottish architect William Adam
 Example sentencesExamples
-  An exhibition mounted to celebrate the tercentenary of the college is on view until April 1 at the Yale University Art Gallery.
 -  This year is a special year for Methodists as it is the tercentenary of John Wesley's birth.
 -  In 1916 he was knighted on the stage of Drury Lane at the conclusion of a special, tercentenary performance of Julius Caesar.
 -  Gilbert was more celebrated in his tercentenary year than he will be today.
 -  In May 2007, the next Scottish election will coincide with the tercentenary of the Treaty of Union.
 -  And, of course, the tercentenary of the 1709 migration is only a few years away.
 -  In addition, the Club's promoters wanted to ensure that Gilbert's place in the history of English science was appreciated and that the tercentenaries of his book and death were observed appropriately.
 -  In 1968, a sixth prize was added, in Economics, donated by the Bank of Sweden to celebrate its tercentenary.
 -  The tercentenary of the creation of Khalsa has given us a lot to think and ponder about.
 -  The focal point of the tercentenary celebrations will take place in Germany - the battalion's current base - next Saturday, when it will receive new colours from the present Duke of Wellington.
 -  The acknowledged stimulus to writing this book was the tercentenary of Peter the Great's visit to England in 1696.
 -  They chose as their theme the tercentenary of chemical industries in America.
 
adjective ˌtəːsɛnˈtiːn(ə)riˌtəːsɛnˈtɛn(ə)ri
Relating to a three-hundredth anniversary.
 Example sentencesExamples
-  The focal point of the tercentenary celebrations will take place in Germany - the battalion's current base - next Saturday, when it will receive new colours from the present Duke of Wellington.
 -  In 1916 he was knighted on the stage of Drury Lane at the conclusion of a special, tercentenary performance of Julius Caesar.
 -  Gilbert was more celebrated in his tercentenary year than he will be today.