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quasquicentennial

[kwos-kwi-sen-ten-ee-uh l]
adjective
  1. pertaining to or marking a period of 125 years.
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noun
  1. a 125th anniversary.
  2. a celebration marking such an anniversary.
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Origin of quasquicentennial

quasqui- one and a quarter (pseudo-Latin, apparently qua(dri-) + (se)squi-) + centenial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018