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semicentennial

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

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
noun
  1. 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