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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.

semicentennial

/ ˌsɛmɪsɛnˈtɛnɪəl /

adjective

  1. prenominal of or relating to the 50th anniversary of some event
  2. occurring once every 50 years
“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

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
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Word History and Origins

Origin of semicentennial1

First recorded in 1855–60; semi- + centennial

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semicentenarysemicircle

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