semicentenary
/ˌsɛˌmaɪˌsɛnˈtɛnəri/
semicentenary means synonym of semicentennial: a 50th anniversary. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
semicentenary is pronounced /ˌsɛˌmaɪˌsɛnˈtɛnəri/.
Etymology
From semi- (“half”) + centenary (“100th anniversary”), q.v.
noun
- Synonym of semicentennial: a 50th anniversary.“The city celebrated its semicentenary last year.”