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Meaning of quasquicentennial

quas•qui•cen•ten•ni•al

Pronunciation: (kwos"kwi-sen-ten'ē-ul), [key]
— adj.
  1. pertaining to or marking a period of 125 years.
—n.
  1. a 125th anniversary.
  2. a celebration marking such an anniversary.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.