Usually means: Fiftieth anniversary of an event.
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We found 9 dictionaries that define the word semicentenary:

General (9 matching dictionaries)
  1. semicentenary: Merriam-Webster
  2. semicentenary: Vocabulary.com
  3. semicentenary: Infoplease Dictionary
  4. semicentenary: Dictionary.com
  5. semicentenary: Rhymezone
  6. semicentenary: FreeDictionary.org
  7. semicentenary: Mnemonic Dictionary
  8. semicentenary: TheFreeDictionary.com
  9. semicentenary: Wiktionary

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Definitions from Wiktionary (semicentenary)

▸ noun:  Synonym of semicentennial: a 50th anniversary.

Similar:
quincentenary, quingenary, centenary, bimillenary, decennary, octaeteris, septennate, hymenean, century, Levantine, more...

Opposite:
bicentenary, sesquicentennial

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Similar:
quincentenary, quingenary, centenary, bimillenary, decennary, octaeteris, septennate, hymenean, century, Levantine, more...

Opposite:
bicentenary, sesquicentennial



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