tricentenary

World English Dictionary
tricentenary or tricentennial (ˌtraɪsɛnˈtiːnərɪ, ˌtraɪsɛnˈtɛnɪəl)
 
adj
1.  of or relating to a period of 300 years
2.  of or relating to a 300th anniversary or its celebration
 
n , -tenaries, -tennials
3.  an anniversary of 300 years or its celebration
 
tricentennial or tricentennial
 
adj
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
tricentenary

adjective
of or relating to or completing a period of 300 years 
WordNet® 3.0, © 2006 by Princeton University.
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