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/ˌsɛˌmaɪsnˈtɛniəl/ · adjective
Of or related to a 50th anniversary, occurring every 50 years..
The city celebrated its semicentennial last year.
Use semicentennial when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Semicentennial means Of or related to a 50th anniversary, occurring every 50 years..
Common synonyms include semicentenary, jubilee, golden anniversary, golden jubilee (50th anniversary of a coronation).
The opposite depends on the specific sense.
The city celebrated its semicentennial last year.
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