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Meaning of semicentenary

sem•i•cen•ten•ar•y

Pronunciation: (sem"ē-sen-ten'u-rē, -sen'tn-er"ē, sem"ī- or, esp. Brit., -sen-tē'nu-rē), [key]
— pl. -ar•ies.
  1. semicentennial.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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