semicentennial

[ sem-ee-sen-ten-ee-uhl, sem-ahy- ]

adjective
  1. of or relating to a fiftieth anniversary.

noun
  1. a fiftieth anniversary.

  2. the celebration of this anniversary.

Origin of semicentennial

1
First recorded in 1855–60; semi- + centennial

Words Nearby semicentennial

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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
  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