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semicentennial

[sem-ee-sen-ten-ee-uh l, sem-ahy-] /ˌsɛm i sɛnˈtɛn i əl, ˌsɛm aɪ-/
adjective
1.
of or relating to a fiftieth anniversary.
noun
2.
a fiftieth anniversary.
3.
the celebration of this anniversary.
Origin
1855-1860
1855-60; semi- + centennial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for semicentennial
  • Their work generated interest in the mission which had otherwise declined since the semicentennial years.
British Dictionary definitions for semicentennial

semicentennial

/ˌsɛmɪsɛnˈtɛnɪəl/
adjective
1.
(prenominal) of or relating to the 50th anniversary of some event
2.
occurring once every 50 years
noun
3.
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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