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semicentennial

[sem-ee-sen-ten-ee-uh l, sem-ahy-]
adjective
  1. of or relating to a fiftieth anniversary.
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noun
  1. a fiftieth anniversary.
  2. 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. 2018

British Dictionary definitions for semicentennial

semicentennial

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