semicentennial

[sem-ee-sen-ten-ee-uhl, sem-ahy-]
adjective
1.
of or pertaining to a fiftieth anniversary.
noun
2.
a fiftieth anniversary.
3.
the celebration of this anniversary.

Origin:
1855–60; semi- + centennial

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
semicentennial (ˌsɛmɪsɛnˈtɛnɪəl)
 
adj
1.  (prenominal) of or relating to the 50th anniversary of some event
2.  occurring once every 50 years
 
n
3.  a 50th anniversary

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Their work generated interest in the mission which had otherwise declined since the semicentennial years.
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