semicentennial

noun
semi·​cen·​ten·​ni·​al | \ˌse-mē-sen-ˈte-nē-əl, ˌse-ˌmī-, -mi-\

Definition of semicentennial 

: a 50th anniversary or its celebration

Other Words from semicentennial

semicentennial adjective

First Known Use of semicentennial

1859, in the meaning defined above

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The first known use of semicentennial was in 1859

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