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semicentennial

[ sem-ee-sen-ten-ee-uhl, sem-ahy- ]
/ ˌsɛm i sɛnˈtɛn i əl, ˌsɛm aɪ- /
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adjective
of or relating to a fiftieth anniversary.
noun
a fiftieth anniversary.
the celebration of this anniversary.
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Origin of semicentennial

First recorded in 1855–60; semi- + centennial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for semicentennial

semicentennial
/ (ˌsɛmɪsɛnˈtɛnɪəl) /

adjective
(prenominal) of or relating to the 50th anniversary of some event
occurring once every 50 years
noun
a 50th anniversary
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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