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semicentenary

[sem-ee-sen-ten-uh-ree, -sen-tn-er-ee, sem-ahy- or, esp. British, -sen-tee-nuh-ree]
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adjective, noun, plural sem·i·cen·ten·ar·ies.
  1. semicentennial.
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Origin of semicentenary

First recorded in 1865–70; semi- + centenary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018