semi·cen·ten·ni·al
| \ ˌse-mē-sen-ˈte-nē-əl
, ˌse-ˌmī-, -mi- \
, ˌse-ˌmī-, -mi- \
Definition of semicentennial
: a 50th anniversary or its celebration
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“Semicentennial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/semicentennial. Accessed 28 May. 2022.
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Time Traveler for semicentennial
The first known use of semicentennial was in 1859
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