tercentennial
adjective or noun
ter·cen·ten·ni·al ˌtər-(ˌ)sen-ˈte-nē-əl 
: tercentenary
Example Sentences
Recent Examples on the Web With great anticipation of the tercentennial celebration, the 300 Year Anniversary Committee is seeking creative logo designs to brand the three-century observance in 2019. 
Courant Community, 27 Mar. 2018
Courant Community, 27 Mar. 2018 Word History
First Known Use
1872, in the meaning defined above
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