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semicentennial

[ sem-ee-sen-ten-ee-uhl, sem-ahy- ]
/ ˌsɛm i sɛnˈtɛn i əl, ˌsɛm aɪ- /
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adjective

of or relating to a fiftieth anniversary.

noun

a fiftieth anniversary.
the celebration of this anniversary.

QUIZZES

QUIZ YOURSELF ON “THEIR,” “THERE,” AND “THEY’RE”

Are you aware how often people swap around “their,” “there,” and “they’re”? Prove you have more than a fair grasp over these commonly confused words.
Question 1 of 7
Which one of these commonly confused words can act as an adverb or a pronoun?

Origin of semicentennial

First recorded in 1855–60; semi- + centennial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for semicentennial

semicentennial
/ (ˌsɛmɪsɛnˈtɛnɪəl) /

adjective

(prenominal) of or relating to the 50th anniversary of some event
occurring once every 50 years

noun

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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