semicentenary

[ sem-ee-sen-ten-uh-ree, -sen-tn-er-ee, sem-ahy-or, especially British, -sen-tee-nuh-ree ]

adjective

, plural sem·i·cen·ten·ar·ies.

1. semicentennial.

Word History and Origins

Origin of semicentenary¹

First recorded in 1865–70; semi- + centenary