Definition of tercentenary noun from the Oxford Advanced Learner's Dictionary

 

tercentenary

 noun
noun
BrE BrE//ˌtɜːsenˈtiːnəri//
 
; NAmE NAmE//ˌtɜːrsenˈtenəri//
 
(pl. tercentenaries)
 
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the 300th anniversary of something the tercentenary of the school’s foundation tercentenary celebrations
See the Oxford Advanced American Dictionary entry: tercentenary